Oh, just to be clear, that wasn't a sponsored segment at the end, I just wanted to talk about the tech.
@joshm3008
16 сағат бұрын
What? No quirky ad sponsors like other channels? Blasphemy!
@FirstNameLastName-okayyoutube
11 сағат бұрын
I love your work even if there is still some unsettled topics that you bring up, I think you have some of the most courage of anybody talking about the physics.
@meraxitech
11 сағат бұрын
Courage is important. And not giga snob like Neil. I mean what if. What if Immaculate Constellation is true. How would the public treat someone like Neil who's been insulting everyone's intelligence. Wonder if it'd be like 10x Diddy
@jimmirow
4 сағат бұрын
@@meraxitech??what??
@illogicmath
12 сағат бұрын
That mischievous smile from Fraser when he answered that question from that Musk fanboy about why NASA doesn't wait for the Starship to be ready to go to Mars is priceless. Just like Fraser's stifled laughter when he explained how the lunar landing in 2026 would be using Starship
@frasercain
3 сағат бұрын
Hey, I'm just reporting the current plans. And as soon as they inevitably slip, I'll report that too.
@rogerphelps9939
2 сағат бұрын
Not 2026. we will be very lucky if it happpens before 2030 and it is highly likely that SLS will have been ditched.
@illogicmath
10 минут бұрын
@frasercain Sure, Fraser, I know. I didn't mean to imply that you weren't doing your journalistic work as excellently as you always do. But you can't deny that there was a slightly wry thought in you regarding our fanboy's question
@illogicmath
5 минут бұрын
@@rogerphelps9939 what about Elon's dreams? Snake oil? Trying to keep hype high so that money keeps coming in? What’s his true aim when he blatantly lies to all of us about the dates? Mind you, I’m not denying that he’s one of the greatest businessmen of all time.
@illogicmath
3 минут бұрын
@@rogerphelps9939 I think NASA will find an alternative supplier for the lunar lander. Perhaps 2028 would be a reasonable date for the mission
@joshm3008
16 сағат бұрын
In a world full of ai videos, one man stands strong...
@zelrex4657
15 сағат бұрын
There are quite a few good sci communication channels. ✨ I recommend Sci Guys if your looking for a good podcast
@vinniepeterss
14 сағат бұрын
yeah....
@notgreg123
12 сағат бұрын
There's a few more... But not many
@petevenuti7355
11 сағат бұрын
For some reason I hear the music from TV show Knight Rider when I read that.
@jamesleatherwood5125
10 сағат бұрын
@@zelrex4657i add Scishow, Science Asylum, Steve Mould, Be Smart, PBS Eons, kurzgesart, Smarter Everyday, and Astrographics to that list
@MichielHollanders
14 сағат бұрын
Very excited that the Europa clipper is getting close to launch!
@andyspoo2
11 сағат бұрын
If life exists anywhere in our solar system (other than us) it's on Europa.
@lazloperry5242
7 сағат бұрын
It's gonna crash at launch rofl
@jimmirow
4 сағат бұрын
@@andyspoo2there's a bunch of life coming in our future finds. Hopefully they are not like us
@bjornfeuerbacher5514
4 сағат бұрын
@@andyspoo2 Or Titan. Or Enceladus.
@benmulvey2704
12 сағат бұрын
Glad to hear you be realistic about Starliner. It has a huge list of things to achieve before attempting a lunar landing, and is well behind schedule on its initial milestones. Not surprising, given who owns it, and their track record of over promising and under delivering.
@rogerphelps9939
2 сағат бұрын
Starliner is a taxi to near earth orbit, not a lunar lander. You mean starship.
@Knsy
13 сағат бұрын
New bottled mars ice cap water, coming in 2073
@sheepwshotguns42
8 сағат бұрын
another 10/10 video, give or take a very accurate plus or minus 40 million.
@AcousticallyYours
9 сағат бұрын
Interesting question concerning why there are no probes other than the polar lander, sent to the Martian poles. However, a more probing question (pardon the pun) might be; why haven’t we sent a number of probes into the Valles Marineris? It seems that there are endless possibilities there.
@rogerphelps9939
2 сағат бұрын
he problem with that is that the reentry trajectory has a very shallow profile. To get into Valles Marineris you need a pretty steep final descent to get in without hitting the surrounding terrain.
@christopherbrice5473
36 минут бұрын
would it be so hard to just have a rover enter from one end and drive inside it? Is it like a huge drop off? No ramps or gentle slopes?
@TarisRedwing
10 сағат бұрын
That seems like such a bad excuse to have not gone back to the poles of Mars. "It didnt work once so we send 10 more to other parts of Mars instead" lol what kinda scientific logic is that.
@bjornfeuerbacher5514
4 сағат бұрын
Very probably, the other missions were already planned and in development when that one probe crashed, so obviously they first went on with those other missions, instead of planning for another land at the poles then!
@MaxBrix
8 сағат бұрын
A good way to imagine gravity diminishing is to picture a sphere around the object. The sphere has a certain amount of gravitational potential acting on it. A larger sphere has the same amount of potential spread out over a larger area so it is less in any area. The amount of potential on any square meter of the sphere changes according to the inverse square law. The total potential on the whole sphere is always the same no matter how far away it gets.
@bjornfeuerbacher5514
4 сағат бұрын
Replace "potential" with "force", then it's right. The gravitational forces decreses according to the inverse square law. But the gravitational potential decreases according to simply the inverse distance, no square involved there.
@marklapierre5629
9 сағат бұрын
Black hole sun. A true classic rock tune.
@CAPSLOCKPUNDIT
8 сағат бұрын
There are two equally terrifying possibilities: that the universe is finite, or infinite.
@ajr993
13 сағат бұрын
17:41 can you answer how using starship is not an insanely ridiculous plan? It's going to require like 10-15 refueling trips so it can make it to the moon. Moreover why would you send a giant spacecraft to the moon when you could send a miniature detachable lightweight craft like Apollo did? Please explain how using starship in this way is a remotely good idea
@jeffbenton6183
8 сағат бұрын
It's closer to being ready than an Apollo-style craft would be. Furthermore, any human lander system needs to do more work than the Apollo one did because Orion doesn't have as much delta-v as the Apollo CSM.
@ajr993
5 сағат бұрын
@@jeffbenton6183 No its not close to being ready whatsoever and the idea of using 10-15 refuelling trips is quite frankly preposterous. Regardless of whether any other craft is viable right now, starship is not suitable whatsoever. Using complex full cycle methane rockets on the moon and hoping that they restart after being in a vacuum for like a week is crazy. It makes 0 sense to send starship down to the moon weighing as much as it did. It would make far more sense to develop something completely new that's realistic than to invest in an idea that is DOA. I would rather restart with a different crazy idea like using nuclear thermal rockets, building a refuelling space station, building some kind of SSTO system--anything other than the inherently bad idea that is starship. There is no chance starship is making it to the moon anything in the next 10 years.
@andreravenna4435
6 сағат бұрын
Thanks for answering my question :)
@DrDeuteron
13 сағат бұрын
MPL, phoenix were NORTH pole of Mars. The northern hemisphere is flat and low (below "sea level"), and we need that extra air to stop. The southern hemisphere is high and bumpy, so not enough air, and no-where to put a huge landing ellipse (unlike MSL and Percy, these were unguided entry). Also: It is not suspected of crashing: it crashed, 100%. The report says the leg-deploy maneuver was a definite fail, but that is a 60m drop, there should be a carcass visible from MRO. It may have tried to land at 10 km, in which case it cratered at very high speed--this is my bet.
@Vulcano7965
14 сағат бұрын
I wonder if Mars poles could not be considered a "training ground" for probes for later landings on icy moons of the gas giants. It's the nearest icy landscape in low atmopheric pressure conditions.
@isaacplaysbass8568
12 сағат бұрын
Thank you Fraser and crew!
@Kru12794
16 сағат бұрын
16:12 Imagine actually asking a question like this unironically...
@connecticutspeechbubble
15 сағат бұрын
Musk fanboys, they do it all the time while ignoring his 0% track record with delivery forecasts in all ventures. On this matter specifically, SpaceX robot mission by 2022, Starship by 2023, Starship with humans on Mars by 2024.
@geohondo
13 сағат бұрын
Hey I'm definitely not a musk fanboy.....just a science, scifi lover and I love space exploration. I hate Elon but love spaceX. How much does SLS cost for its 1 time use? I feel like investing in non reusable rockets at this point is just wasteful. And Frasier explained why very well to me. Love this channel
@notgreg123
12 сағат бұрын
@@geohondothe point of SLS is that it keeps all the contractors happy and is popular in Congress. This is vital because if Congress isn't happy with NASA then things go south. Ironically SLS is providing a hell of a lot of NASA's funding right now
@sleepy_143
10 сағат бұрын
Hi Mr. Cain. My name is Andrew Pokey and I've always wanted to ask, what happens to all of the specialty tools and power drills NASA has made over the decades and doesn't need anymore? Thanks!
@AttackChefDennis
15 сағат бұрын
Leaving your home in an evacuation is so freaking scary and hard to do. It's all your property and belongings. I haven't had to evacuate, and I have lived here in Broward all 57 years of my life. Hurricane Andrew in '92 was the worst.
@rm-gh1co
13 сағат бұрын
@@AttackChefDennis A few months ago I got an imminent evacuation notice due to to a fast-moving fire a couple of blocks away. And I wasn't at home. Lots of evacuations. Even the humane society. Fortunately, because it was close to the airport, A helicopter picked up a load of water in between him and fireman dowsing the fire, They were able to keep it from spreading. But, I've known many people who lost everything to fires in Oregon. Everything.
@AttackChefDennis
3 сағат бұрын
@rm-gh1co Wildfires are no joke! I'd much rather have a few days notice with even the biggest hurricane.
@acanuck1679
11 сағат бұрын
My vote is for "Belsa". The question about gravity and whether objects that are very far away exert some gravitational influence on us here on Earth was quite good, too. Then again, your entire webcast was excellent. Thank you.
@unclvinny
14 сағат бұрын
Edora was my favorite question, but the Mars poles question was a close second.
@bilthon
14 сағат бұрын
You say it's "better to remain flexible" just because you're not footing the bill. The incredible costs SLS has had definitely means resources were deviated from other places where it would have potentially being used more productively. And sure, Starship is not ready, but it's moving faster and seems on the right track to be a more efficient alternative to SLS. So the question is at what point does that become clear to everyone and SLS is allowed to finally die?
@nias2631
9 сағат бұрын
I'd love to see Musk sink his personal billions into his dream goal and save the tax payers the costs completely. He lost billions on Twitter. He should do it for his ultimate dream.
@nias2631
9 сағат бұрын
Musk can pay for it out of his own pocket. He should do that.
@frasercain
3 сағат бұрын
Whenever Congress makes the decision and pulls the plug. Right now, it's the law that NASA must implement the plan as defined by Congress.
@andyspoo2
11 сағат бұрын
Question for you: Why is it that old pictures taken on Mars are quite red, and now modern photos show it in a more neutral color that looks more earth like?
@MichielHollanders
9 сағат бұрын
@@andyspoo2 it must have have been moving away from Earth at the time of the old photos? 😄
@rogerphelps9939
2 сағат бұрын
It is just a case of colour calibration. Todays probes generally have a colour chart with which the raw picture data can be adjusted tto account for the ambient lighting conditions.
@christopherbrice5473
34 минут бұрын
@@rogerphelps9939the ambient lighting conditions unique to the planet are all I care about as a casual observer. I don't want color correction to make it look like Los Angeles
@CyrilleParis
13 сағат бұрын
The problem with Stalink and other constellations of this size is not astronomy : it's a HUGE CLIMATE AND ENVIRRONMENTAL threat. At the rythm we lauch rockets nowadays, the impact on the envornment is a drop in the ocean compared to other activities. With these constellations, we will multiply this by several thousands every 3 or 4 years. Three main consequences : 1- the CO2 emissions : and even with hydrogen-oxigen propultion, there will be CO2 producede by the construction of the whole thing, multiplied by thousands of times what it is now 2- water in the mesosphere : when you drop water vapor up to 50 km, it goes into the water cycle and it doesn't affect the average quatity of water in the atmosphere. After 50 km, the water stays there and acts as a greenhouse gas 3- dozens of thousands of these satelites will fall down each year and burn in the outer atmosphere, dispersing tons of nanoparticules of a lot of things. One of the worst is aluminium : bye-bye ozone layer! All that for you to be able to watch Porhub in 4K in the Sahara.
@rogerphelps9939
2 сағат бұрын
CO2 emissions from rocket launches are miniscule compared with those from generally burning fossil fuels. Suppopse there are 100 launches annually and each one uses 100 tons of fuel. Burning each ton might release 3 tons of CO2. That makes 30,000 tons of CO2 per annum. Humanity currently emits around 40 billion tons of CO2 annually. So regardless of the actual CO2 emissions from rocket launches they are negligible compared with the total. Above 50km, ultraviolet light from the sun dissociates water into hydrogen and oxygen so it is not going to hang around for long. As far as aluminium is concerned I bet nobody has done an estimate of the amount of aluminium delivered to the upper atmosphere by meteorites. It seems likely to me that it is going to be a lot more than from reentering starlink satellites. The big problem with Starlink is its impact on optical astronomy which is not good. I really doubt the business model of Starlink. On the ground high speed optical fibre networks are delivering bandwidths much greater than Starlink can for less money. Here in the UK even the most sparsely populated areas are being cabled up so the demand for Starlink is minimal. This will happen in most developed countries where people gravitate to cities. In other places such as sub Saharan Africa they just cannot afford it anyway. That leaves a few well off people living in remote areas, shipping and the military.
@marklapierre5629
9 сағат бұрын
The X-37B is what the Space Shuttle would have been if it had not been designed by committee.
@seangallagher779
4 сағат бұрын
@@marklapierre5629 … a Senate committee, at that.
@geraldinefields1730
11 сағат бұрын
Thank you.
@rogerphelps9939
2 сағат бұрын
I understand that the failure of the Mars Polar Lander was because some subcontractors were still in the stone age and using Imperial, customary, US or whatever they are called units and other more enlightened subcontractors were using SI. Unfortunately the software didn't know about this and that was that. Hopefully it is a requirement for all current and new contracts that only SI units are used, just like in pretty much every country apart from the US.
@jblob5764
7 сағат бұрын
Im extremely excited for IFT 5 on the 13th
@bjornfeuerbacher5514
4 сағат бұрын
"How old is the universe?": One should also mention that astronomers are able to measure the ages of stars, and these all are found to be at most around 13.5 billion years. Additionally, when one measures the ages of stars in far-away galaxies, which we see as they were in earlier times, one sees that these stars indeed are _younger_ by the corresponding amount of time.
@RandallSoong-pp7ih
15 сағат бұрын
Thank you!
@Quickcat21MK
15 сағат бұрын
I think we should manufacture a 150 meter telescope on the moon. I know, its a mega project. And the moon has lots of hazards. But it would be really really cool. Could be done in 20 years if we tried. Maybe more.
@jpaulc441
15 сағат бұрын
A visible light telescope? I don't think we could make a movable telescope that large even here on Earth. A smaller radio telescope on the far side on the moon would be really useful though. It's the only place where all artificial radio waves from Earth could be completely blocked.
@FloridaManMatty
13 сағат бұрын
Better yet, send multiple smaller devices that are spread out over multiple kilometers and have an operational lunar interferometer instead. No need to make a 150m telescope when you could literally have a 1500m or even a 15km system. The technology absolutely exists and is almost sort of “average” already. It would require multiple trips and plenty of preparation before, but it IS possible with stuff that already exists.
@Quickcat21MK
13 сағат бұрын
@@jpaulc441 If I had to make a choice. I would say whatever is optimal to get images of planets. It would be amazing, even if it was IR or some other type.
@Quickcat21MK
13 сағат бұрын
@@FloridaManMatty Or this.
@bobinthewest8559
12 сағат бұрын
@@jpaulc441… Everyone mentions the “frequency clean” environment on the far side of the moon… But won’t that cease to be true once we begin putting infrastructure in place there? Wouldn’t every bit of communication hardware have to be connected by cables to prevent that ambient noise from developing?
@Jameson1776
13 сағат бұрын
Thanks for the answer Fraser. I knew you had no inside info to share just wanted your thoughts. 🙏
@snortworld
4 сағат бұрын
Fraser, question: has there ever been any scientific ideas about the magnitude of the universe? we know how small matter might be, and how vastly large the universe might be, but could the magnitude of the universe be infinite?
@tuckfeem0834
12 сағат бұрын
Hi Fraser! If there is so much outside the observable universe, could it be that some gravitational force (another bubble universe?) out there is causing the expansion and that dark energy is only having a somewhat local effect?
@PitchWheel
4 сағат бұрын
Can we say that the galaxy is the accretion disk of the central black hole? Thank you
@HPA97
14 сағат бұрын
Hi Fraser! What would happen if the Andromeda galaxy suddenly disappeared, like in terms of gravitational influence? And how much would our solar system change/deviate compared to Andromeda galaxy still existing over large time scales?
@jcollins8639
5 сағат бұрын
How is it proven that gravity travels at the speed of light?
@frasercain
3 сағат бұрын
The recent kilonova of two colliding neutron stars was the final piece of evidence. We saw the radiation from the explosion at the same time that the gravitational waves arrived.
@potato9832
3 сағат бұрын
By measuring the time differential between two or more gravity observatories such as LIGO and VIRGO. They will not detect the waves at precisely the same time. Given the simple fact V=d/t one can calculate the velocity of the wave by knowing the distance between observatories and the time difference between detections.
@Jedward108
12 сағат бұрын
Given the long time frame of exploratory missions such as Europa Clipper, and the uncertainty of political stability, do any space agencies include contingency plans in case no one were available on earth to receive transmissions?
@billygoat520
11 сағат бұрын
I believe wherever one is to be the center of this universe, maybe not for others.
@frictionhitch
10 сағат бұрын
Dark Energy is a fairy tale
@leuk2389
11 сағат бұрын
Hey Fraser. I like to think I have a pretty good grasp of physics but there is one thing I simply cannot wrap my head around. How can there be an absolute speed limit (the speed of light) when velocity is relative and there is no absolute frame of 0 movement?
@bjornfeuerbacher5514
4 сағат бұрын
Not every velocity is relative. Light _always_ moves with light speed with respect to an observer (in General Relativity, a _comoving_ observer), so that speed _is_ absolute.
@idodekkers9165
4 сағат бұрын
hey Fraser talking about gravity, when trying to get to another star, will we need to "power" the spaceship up to the gravitational equilibrium point between the stars, or is getting a certain amount of distance from the sun enough to ignore the residual gravity?
@bjornfeuerbacher5514
4 сағат бұрын
You need enough velocity to reach that equilibrium point, you don't need to accelerate the whole way up to that point.
@kieranlangley3092
15 сағат бұрын
Love your videos. Never stop please. I'll support you as long as you never use AI :) best wishes to you Fraser.
@LG123ABC
2 сағат бұрын
What would happen if we started building extremely large telescopes on the surface of the moon? Would that be beneficial? Could we get even better astronomical views? Also, could we use the moon as a launching place for future interplanetary/interstellar missions? Would the lower gravity of the moon make it easier to build and/or launch missions into deep space? Basically, I was wondering if the moon would make a good observation point or spaceport if we built a permanent base there.
@meraxitech
11 сағат бұрын
Immaculate Constellation
@SnareGG
17 минут бұрын
Q: 'whats the distance limit on the supermassive black hole's gravity?' A: yes.
@habibv
12 сағат бұрын
Ardena Hi Fraser, When we say the Big Bang was the beginning of the universe, how can we also say the universe might be infinite? How can something with a starting point be infinite? Logically, this doesn't seem to fit. Regards, Habib
@Zuringa
14 сағат бұрын
If the universe is much bigger than the visible universe, how come we can see the cosmic microwave background?
@tonywells6990
11 сағат бұрын
The CMB was produced at a particular point in time everywhere in space, and the light from it is still moving through space in every direction, from every location. CMB photons from a distant location beyond the edge of the observable universe is still travelling towards us and will still do so far into the future depending on the total size of the universe.
@TheAces1979
14 сағат бұрын
Cartego - My thoughts on this one. There is no 'outside' to the universe. The universe IS outside. And that terrifies me.
@Threedog1963
13 сағат бұрын
Sounds like you are talking about the observable universe vs the possible infinite universe.
@bobinthewest8559
13 сағат бұрын
It seems to me… All of the methods for deriving the “age of the universe”, rely on the concept of “rewinding the clock”, or “reversing the expansion”… which sounds all well and good… But, doesn’t this only apply to the “observable universe”? And if the observable universe is (let’s say) 93 billion light years across… wouldn’t that only reduce that volume down to a singularity/point, which would itself be at the center of a (then) observable universe of 93 billion light years across? Or, in other words… “rewinding the expansion”, would merely “draw in” a volume of space that we are currently unable to observe due to the current distance from our location.
@RussetPotato
7 сағат бұрын
Fraser hey and stuff. Do you know if astronomers are developing a constellation tracker to weed out satellite data from the readings? Since it’s always shared the science community would need track them I would think. And if say Vera Rueben has a constellation tracking algorithm would that be a strategic resource… to be able to pin point all the micro satellites
@aalhard
15 сағат бұрын
12:36 I think he meant, where does Sagittarius A become gravitationally dominant?
@CoreyKearney
14 сағат бұрын
The smarter question would have been what is practical limit of the influence our black hole, but that's not what they asked was it.
@ericsmith6394
15 сағат бұрын
If the models are correct wouldn't the CMB light be from hydrogen and helium? I thought the only heavier element at the time was traces of lithium. Why is it wrong to assume the CMB is entirely redshifted hydrogen and get an age from it?
@Phil_AKA_ThundyUK
54 минут бұрын
What are the implications of orbital refuelling on mission times to the outer solar system?
@horizonbrave1533
16 сағат бұрын
Question Fraser!! you always say that gravity/orbital assists from spacecraft etc, "steal" some of the velocity from the planet or body and convert it to energy that the space craft uses. Thus slowing down the planet or body every so slightly.... But doesn't the planet/body regain this 'stolen' momentum as it itself careens around the sun? (thus 'stealing' some of the sun's velcocity from it, to get the planet/body back up to it's 'recovered' normal velocity? And then in turn doesn't the sun 'steal' some velcoity from it's own orbit? So shouldn't these gravity assists equal out to no loss given enough time?
@kkgt6591
15 сағат бұрын
Very interesting question 😊
@ericsmith6394
14 сағат бұрын
Orbits are trading energy all the time, but they can't create or destroy it. You might end up with a system that looks the same within your best ability to measure it, but it is different. The Moon is a good example. Suppose you gave it a little spin. Over time it will tidally lock to Earth again. The spin momentum is transferred to Earth. It looks a lot like the Moon magicked it's way back to 'normal' but the combined momentum of the Earth and Moon still has the momentum you added when you spun the Moon. A lot of objects in the solar system are either locked to or in resonance with other things. A small push to one of them will slowly get shared with the rest. This won't put them back how they were, but it can preserve certain relationships like the Moon being tidally locked to Earth or the orbital resonance between Jupiter's moons. Depends on whether the resonance is stable or not.
@arnelilleseter4755
14 сағат бұрын
No. A planet doesn't just pop back to it's old trajectory. If it's orbit changes it stays that way until something else affects it.
@horizonbrave1533
13 сағат бұрын
@@arnelilleseter4755 I'm not talking about the trajectory, I'm talking about the rate at which it's moving.
@arnelilleseter4755
12 сағат бұрын
@@horizonbrave1533 It's the same thing. The orbit is directly related to the velocity. If you change the speed you change the orbit.
@dm1045
4 сағат бұрын
You may have answered this before, but in what direction from us did the Big Bang happen? Secondarily- you discussed the expansion of the universe and that everything is moving away from us - but isn’t there a direction from the center we are moving?
@bjornfeuerbacher5514
4 сағат бұрын
The universe has no center. The Big Bang happened at every point of the universe at once. It was _not_ an explosion happened at a point _inside_ of space, but the appearance and expansion of space itself. Picture a balloon which initially is a single point, which expands to a sphere. The _surface_ of the balloon, i. e. the sphere, represents the universe, all of space. (If the universe is closed and finite - that's far from certain.)
@frasercain
3 сағат бұрын
It's happening everywhere. Every part of space is moving away from every other place. So everywhere is the center and nowhere is.
@efxnews4776
3 сағат бұрын
In the equatorial region of Mars temperatures can reach 21⁰C, during the martian summer, room temperature to humans. In Martian poles teperatures are way too cold even to machines operate.
@tjmcguire9417
2 сағат бұрын
Fraser. I don't know your background or your bona fides. I have watched you for some time and see what you do. Excellent work. So. As a Frazer myself, I am going to help fund you. Not sure how that's done because I never di this) but I will figure it out. Cheers laddie.
@frasercain
Сағат бұрын
Thanks, my background is that I've been a space and astronomy journalist for 25 years.
@gregkelly2145
8 сағат бұрын
"All these worlds are yours except Europa. Attempt no landing there..."
@FirstNameLastName-okayyoutube
11 сағат бұрын
Yeah there's a big logical jump in the microwave cosmic background but I like this guy and I'm going to give him a chance to not just repeat the same wiki page stuff experts keep on doing. You can't see light coming out of an object away from you unless it reflects off something, and if you see it billions of years after the fact it has to reflect off something half the distance of the light years you predict the age of it to be.. so what would be the microwave backgrounds reflective surface? Magic seems to be the answer
@Kris_Lighthawk
10 сағат бұрын
Where did you got the (very wrong) idea that you can only see light that have reflected off something? When I look at a lightbulb, the sun or star, that light have not reflected off anything, it goes straight from the source to my eye.
@FirstNameLastName-okayyoutube
9 сағат бұрын
@@Kris_LighthawkI decided to ignore the rudeness. The Cosmic microwave background is not the same thing as red shift, so it's not about a linear path. So in your light bulb analogy it would be like your inside the light bulb and then you see the light billions of years later. The light is supposed to be from when there's only a few hundred thousand light years apart not much bigger than the Galaxy. Please control yourself and not try to say that you don't understand what I said
@hive_indicator318
4 сағат бұрын
But why would it have had to reflect off of something?
@frasercain
3 сағат бұрын
The CMB was released at a time when the Universe was like the surface of a red giant star. No reflection needed.
@bobinthewest8559
13 сағат бұрын
X37B: Here’s some conspiracy theory fuel… X37B, is actually a “long range program”. There are multiple X37B vehicles that are sent on missions of two to five years in duration, traveling vast distances to other star systems and interacting with alien civilizations. The launches and returns, are coordinated so that a departing mission launches shortly before a prior mission returns… and by claiming it is the same mission, it gives the appearance that they are only conducting much shorter missions. 😉😉😉 😂😂😂😂
@Threedog1963
13 сағат бұрын
If the universe is infinite, how would you know how old it is based on rate of expansion? You can only judge the expansion based on the observable universe, which could be only a tiny bubble of an infinite universe. I'd go as far as to say, in an infinite universe, the age of the universe is infinite and had no beginning.
@Change3D
12 сағат бұрын
I just wish google had a decent LLM for their notebook LM.
@MildMaxUW
7 сағат бұрын
If you could dig a hole right through the Earth and ignoring heat and pressure issues, what would happen if you jumped into it?
@ragetail3
54 минут бұрын
Are all the galaxies moving away because of the big bang, or are they in some sort of orbit related to super clusters?
@joshm3008
16 сағат бұрын
Hi Fraser hope you're doing well
@arthurprentice7110
6 сағат бұрын
Could gravity be caused by the resistance of matter to the expansion of space/time ?
@ericbutler6990
13 сағат бұрын
x37 doesnt have any patched over doors apparently
@jakeryan3884
11 сағат бұрын
Question: According to current cosmology, the universe is expanding and accelerating somewhere around 70 Km per second per megaparsec. Much of this is assumed to be pressure from dark energy. Red shift, Cepheid variables and the Cosmic background radiation all support this, though they do not quite agree on the exact rate. If a galaxy or other object is observed and estimated to be 12 million light years away (such as Centaurus A), or about 3.7 megaparsecs, and accelerating away at 70 KM per second per megaparsec, it seems to me that the object should disappear within minutes and never be seen again. Can we still see it? Do we see it a day later, 84,600 seconds later? According to that math the object has accelerated during that time to many many times the speed of light. The light would be far out of any radio spectrum. . 70 km/sec X 8.4x10^4 seconds X 3.7mps = 2176X10^4 Km/sec. Since the speed of light is a mere 300,000 Km/sec this does not make sense. Even if the velocity was zero when the first observance was made, the Velocity a day later is somewhere around 72 times the speed of light. We should be seeing distant galaxies disappear frequently as they accelerate out of our range to see. What am I missing? Jake Ryan
@stevenwojtysiak6392
15 сағат бұрын
On science channels, one hears all the time that the parts of the universe beyond our ability to see is forever lost to us, because even travelling near the speed of light, the universe is expanding so fast we can never get there. Is this idea working under the assumption that either the universe is infinite or it is infinitely expanding (and what's the difference between those two ideas). Is there anything in our current understanding of the universe that says a "big crunch" isn't happening right now on the far side of the universe and that's where everything is rushing towards?
@bjornfeuerbacher5514
4 сағат бұрын
What is "the far side of the universe" even supposed to mean? Everything is rushing away from us, in _all_ directions, spherically. So how can you say that there is a location everything is rushing towards??? "infinite" usually refers to space, i. e. size, whereas "infinitely expanding" usually refers to time. So yes, there is a difference.
@ZachariahJ
3 сағат бұрын
I knew those swarm satellites would be a problem! But when I mentioned it a few months ago, you shrugged it off - even went to the trouble of replying to my dumb comment to shrug it off! I feel totally vindicated. (Which doesn't happen often - I generally have no idea what I'm talking about). ;-)
@michaelcox1071
9 сағат бұрын
Re: SLS - "what else do you want?!" I want it done for a reasonable cost. The SLS is 70s tech at astronomical prices. We could have used Falcon Heavy for a tiny fraction of the SLS cost. Just the transporter cost like 2.8B dollars. And they had to make a second version! More billions! As a US taxpayer, I hate SLS, even though I want to see cities on the moon.
@michaelcox1071
9 сағат бұрын
Also, I noticed that your launch cost graphic didn't include SLS...
@andyspoo2
11 сағат бұрын
The amount of weight Starship can launch is dropping as it adds more insulation.... Just so hou know.
@valaroma
14 сағат бұрын
What is the earliest possible time that an alien civilization can arise since the birth of the universe? What would the CMB look like for them?
@bobinthewest8559
12 сағат бұрын
The only reference we really have for this… is the time it took for our solar system to “develop us”. So as of now, the best estimate is likely around 4 to 5 billion years (I’m not entirely certain of the age of our solar system).
@valaroma
3 сағат бұрын
@@bobinthewest8559 My comment goes behond our solar system. At what point in time there were enough elements to support carbon based life and technology somewhere in the universe after so many generations of stars cooking the ingredients for an advanced civilizaion. What would the CMB look like back then and what kind of information those aliens would extract from this?
@parthhappy
14 сағат бұрын
Hey Fraser, please please take my question :) What is a wormhole? Is it possible to create a wormhole in a lab? I was looking into the equations of a sphere and hyperboloid and realized that while one represents the shape of a blackhole, a hyperboloid could represent a wormhole.
@bjornfeuerbacher5514
4 сағат бұрын
A wormhole is a certain possible solutions of the equations of General Relativity, roughly speaking, a connection between a black hole and a white hole. No, we cannot create that in a lab. No, a hyperboloid does not represent a wormhole, where did you get that idea from?
@parthhappy
3 сағат бұрын
@@bjornfeuerbacher5514 Hey thanks for the answer. The idea of Hyperboloid popped in me as I have seen wormholes represented as a tunnel in scifi movies. Moreover, wormhole seems the counter part of a blackhole ( where you cannot be sucked in forever, as you will be thrown out of a worm hole). Replacing the + in the equation of sphere x^2 + y^2 + z^2 = 0, you kind of get a general formula representing a hyperboloid. Thats how I my thought process started ;).
@bjornfeuerbacher5514
2 сағат бұрын
@@parthhappy Scifi movies do _not_ accurately represent wormholes. No, a wormhole is not the counterpart of a black hole; the counterpart of a black hole would be a white hole. As I already wrote, a wormhole would be the _connection_ between a black hole and a white hole. "Replacing the + in the equation of sphere x^2 + y^2 + z^2 = 0" You probably meant "= 1"? If you really use "= 0", you don't get a sphere, you only get the single point (0,0,0). And why should one replace the + there? Which + do you even mean? Essentially, there are three of them, in front of every of the three squares. And a (non-rotating) white hole also would be spherical. If you really want to have formulas for the geometry of black holes, white holes and wormholes, you should look up "Kruskal-Szekeres coordinates".
@parthhappy
2 сағат бұрын
@@bjornfeuerbacher5514 yes i meant "=1" sorry. I checked the equation of Hyperboloids and they could have essentially up to two sign changes compared to spheres. I will have a look. Thanks a lot. :) I will also dig in a bit more into White hole.
@parthhappy
2 сағат бұрын
@@bjornfeuerbacher5514 One question, if a worm hole is a connection between a black hole and a white hole, it means it cannot be entered from both ways or? You could only enter through the black hole and get thrown out of a white hole. But not vice versa. Is it so?
@fuegofool
12 сағат бұрын
But would it wash away the rain? 12:46
@dannypope1860
6 сағат бұрын
Short answer: they have NO IDEA how old the universe is… they only have a best guess of the age of the ”observable universe”… The universe is so much larger than the observable universe. I wouldn’t be surprised if the universe is 50 billion years old.
@smorrow
Сағат бұрын
*Fermi paradox intensifies*
@iancudmore9795
5 сағат бұрын
If satellite constellations are such a problem, why couldn't more/some of those have telescopes? Wouldn't that give us a telescope the size of the earth? Wouldn't that be great?
@TheCosmicGuy0111
15 сағат бұрын
Sweet
@GadZookz
15 сағат бұрын
Fraser Cain: Did you see any geologically active examples of volcanism or geothermal activity during your recent journey beyond the Wall?
@frasercain
3 сағат бұрын
Absolutely. We went to a geyser complex. No erupting volcanoes at the time, though.
@JacquesMare
10 минут бұрын
Reason: Cold AF.....
@Starman_67
8 сағат бұрын
ALARIS
@user-gv4cx7vz8t
11 сағат бұрын
Before watching, I see two Mars possibilities: 1) They may find life, and don't want to disturb it, and 2) They may find life, and don't want to tell us about it.
@rogerphelps9939
2 сағат бұрын
And why would they not want to tell us about it? Scientists and engineers have beavered away for decades trying to answer this question. If they find life their efforts will have been justified and it would be the greatest story of all time. Even if someone tried to suppress it they would fail.
@Morganstein-Railroad
12 сағат бұрын
Gravity Does not travel. It is a property of the existence of matter in the space of the universe. Gravity is caused by the impression that the object pressing on the fabric of the universe, creating what is often described as a "Gravity Well". By this definition, gravity is instantaneous. If you were to remove the oject, the effect of the gravity well would instantly cease to exist, and you would not still feel the effect of the gravity from that object until the gravity caught up with us, because the curvature of space caused by the obect would no longer exist and the gravity would not be felt anymore. That would be an instant effect.
@tonywells6990
11 сағат бұрын
If the Sun disappeared it would take time for the gravitational field to change, at the speed of light. There is no instant effect.
@frasercain
3 сағат бұрын
The 2017 kilonova showed us that radiation and gravity move at the same speed.
@Happyland_Motel_Gamer_Cat
2 сағат бұрын
If there was a Big bang that must mean there are Multi universes.
@michaelgian2649
7 сағат бұрын
Alaris
@User87_
3 сағат бұрын
FYI astronomers don’t know the age of the universe. They never will
@frasercain
Сағат бұрын
How do you know?
@gteichrow
13 сағат бұрын
A few important things should be noted regarding low orbit constellations: SpaceX followed all requirements that their license for the existing phase of the StarLink constellation and are bending over backwards to mitigate impacts on science. Future constellations like Project Kuiper and the Chinese Geespace system are coming soon. How will their constellation impact science? Few attempts are made to consider the benefits that these constellations are going to have for all, including science. They are quite considerable Earth based observations are already mitigating the impact these constellations will have on science, particularly with their quite deterministic orbits. It’s dissatisfied that Fraser didn’t take a minute to quickly summarize one or more of these aspects.
@nias2631
9 сағат бұрын
Sounds like you can summarize for us. You said they are quite considerable. Can you lay them out here in this thread. It would help everyone to see your argument.
@jeffbenton6183
8 сағат бұрын
@nias2631 I second this. There's very little scientific benefit to the mega-constellations that I'm aware of (or can dream up -and I have *a lot* of ideas for space probes. Actually, I have dreamt of some cheap things that Starlink could do, but existing comsats can do 'em too). I'm all ears.
@lightfdar
14 сағат бұрын
So what happens if the universe is cyclical and the start of our expansion is the end of one dark age?
@Star_Jewel_Realm
8 сағат бұрын
Why? Simple. It is where the infamous Martian Goblin lives. 😅 He is responsible for all failed NASA probe missions to Mars. 🤔
@illogicmath
14 сағат бұрын
The big problem with dating the universe is that it is not known for certain whether what lasts one second today also lasted the same when the universe began. It could be that if we take today's second as a standard unit, the second from, say, 10 billion years ago could have lasted a quantity n times the current second. To such an extent that this variable n could tend to infinity as we go back in time, so the universe could very well have an infinite age
@tonywells6990
11 сағат бұрын
There's no observational evidence of any physical constants, or the passage of time, that have changed over time.
@illogicmath
7 сағат бұрын
@@tonywells6990 How do you measure time if there are no atoms, only pure energy? Time is defined in a very precise way based on certain oscillations inside atoms. But if there are no atoms, only pure energy, how do you define time?
@sanjaygatne1424
14 сағат бұрын
Age of the universe "Ha Ha Ha".
@patrickgriffiths889
14 сағат бұрын
SLS exists and works.
@Shadinsb
14 сағат бұрын
😂
@ChaosCat79
13 сағат бұрын
@@Shadinsb Come back to NASA when SpaceX can get Starship to do a test flight mission that orbits the Moon and successfully lands the crew module safely back on Earth again. The SLS, for all the issues with it's cost and overruns and delays, has done that on the first try.
@estraume
12 сағат бұрын
SLS might will be the last launch system designed by politicians. 😆
@j7ndominica051
32 минут бұрын
The launch costs for Starship won't come down. Nasa has to finance Musk's toys and crazy projects, fines and politics. If I could see my backside in a curved, finite universe, I wonder which direction would it be.
@Jameson1776
13 сағат бұрын
Belote
@gavinthomas214
11 сағат бұрын
Ardena
@leonardharvey777
15 сағат бұрын
I wonder if Fraser realized he was comparing the Starship results from things that SLS isn't able to do at all? Not really apples to apples there. But yes realistically Starship has a few more milestones to go.
@patrickgriffiths889
14 сағат бұрын
Starship does not exist. It just about burned up on the last try. Progress? Sure. But SLS exists and has already been to the moon.
@tonywells6990
11 сағат бұрын
@@patrickgriffiths889 SLS also burned up. Only the Orion capsule survived.
@patrickgriffiths889
14 сағат бұрын
I understand the value of AI for sifting through data. But I have no interest in AI generated podcasts.
@frasercain
3 сағат бұрын
You should try it for something that's really challenging to help you understand it. Or don't. Do whatever you like.
@auyemra1331
11 сағат бұрын
all your answers have follow up questions that are extremely important. as you completely do not address the obvious.
@frasercain
3 сағат бұрын
Feel free to ask them. Otherwise the whole show would cover a single question and still have follow-up questions.
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