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Veteran space shuttle astronaut, Bruce Melnick, answers the questions YOU sent in via the BBC Newsround website.
Bruce is no stranger to space.
Throughout his career, Bruce has worked on different satellites - including helping deploy the Ulysses satellite in orbit around the sun!
He took part in space shuttle missions in the 1990s, and was awarded several special NASA medals.
During one of his many orbits of the earth, he helped with a three-person space-walk. This was the first time three people have taken part in a space walk together!
What is a spacewalk?
A spacewalk is the term astronauts use for heading out into space, with a suit on.
They're attached to a ship or shuttle by a long cord, which can bring them back in if anything happens.
Spacewalks are usually done to fix the outside of ships - they happen regularly on the ISS!
Alexei Leonov was the first man to do a spacewalk in 1965, and the first woman was Svetlana Savitskaya in 1982.
Bruce now helps run the Kennedy Space Visitor centre in Florida, in the USA, alongside some other astronauts that used to work at NASA.
Members of the public can go and learn about space, and hear from people like Bruce about what it's like to be an astronaut!
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Негізгі бет Ойын-сауық How Do You Poo in Space? 💩👩🚀 | Astronaut Bruce Melnick Answers YOUR Questions | Newsround
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