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Caleb Scharf, Director of Astrobiology at Columbia University, answers your questions!
1. If you were standing near the event horizon of a black hole and someone pointed a beam of gamma rays at you? Would they remain gamma rays or turn into something else? —ciaran mccormick
2. If the universe is expanding, and galaxies are moving farther apart, then why is it that the Milky way and Andromeda galaxies are on a collision course? —theinsanity3
3. Why does the planets, astroids (in general) in our solar system orbit the sun in a flat orbit with all the planet in the same plane ? the same thing with the solar systems orbiting galaxies? —yassine Laarichi
Find out more about Caleb: goo.gl/1RnC9
Leave your questions in the comment section or ask it in a video response. An expert will be back to answer 3 more of your questions. Thanks for watching!