Why do astronomers believe that there is a large black hole, ...

[Themember4]

Why do astronomers believe that there is a large black hole, around 4 million times the mass of our Sun, in the Galactic center?
 
  What will be an ideal response?

Question 2

All the following statements are true. Which one follows directly from Kepler's third law (p2 = a3)?
 
  A) Venus orbits the Sun at a slower average speed than Mercury.
  B) Venus is more massive than Mercury.
  C) Venus takes longer to rotate than it does to orbit the Sun.
  D) Venus has a thicker atmosphere than Mercury.

[jonathanballen97]

Answer to Question 1

Observations of the Galactic center show a large amount of energy being produced. Radio observations show a ring of gas with a high rotation speed around the center, showing a very large mass. The structure seen in higher resolution radio observations is peculiar. These observations are consistent with an accretion disk around a supermassive black hole.

Answer to Question 2

A

[Themember4]

Wow, this really help

[matt95]

YES! Correct, THANKS for helping me on my review