参考
Why Doesn't Earth Have Rings?
• Why Doesn't Earth Have...
Using the Roche Limit to Make Earth a Ringed Planet
gizmodo.com/using-the-roche-l...
If Earth had Rings
• If Earth had Rings
What if Earth had rings?
www.livescience.com/what-if-e...
a nifty thought experiment: the Earth with rings
josephshoer.com/blog/2009/11/t...
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Негізгі бет Ғылым және технология 【ゆっくり解説】なぜ地球には輪がないのか?-もし地球に輪があったら何が起こるのか-
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