Caleb Scharf Answers Your Questions - Ask the Experts #17

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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

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