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Intro to Astronomy: Please CONCISELY answer these questions, thank you! 1.) Suppose the amount of mass...

Intro to Astronomy:

Please CONCISELY answer these questions, thank you!

1.) Suppose the amount of mass in a black hole doubles, does the event horizon change? If so, does it grow, shrink, or stay the same size? And what physical force limits the growth of supermassive black holes?

2.) Assume that the distance from one edge of the Milky Way Galaxy to the other is 1 cm, with this same scale how far away is the Andromeda Galaxy? Why do astronomers believe that gravitation in the universe is dominated by dark matter?

3.)Consider a stellar black hole that used to be a 100 solar mass main sequence star and a planet orbiting around it at 10 AU. From the planet's position (pretend it survived the Type 2 supernova), was the star or black hole a stronger gravitational object?

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