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Author Question: A nearby galaxy has a radius of 4,000 million A.U. and rotates once every 800 million years. What is ... (Read 89 times)

silviawilliams41

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on: Jul 27, 2018
A nearby galaxy has a radius of 4,000 million A.U. and rotates once every 800 million years. What is its mass in solar masses?
 
  What will be an ideal response?

Question 2

Where on Earth would you be if Polaris were directly overhead?
 
  A) North Pole
  B) Arctic Circle
  C) Tropic of Cancer
  D) Equator
  E) It lies overhead everywhere on Earth.


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InfiniteSteez

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Reply #1 on: Jul 27, 2018
Answer to Question 1

Using Kepler's third law, P2 = a3/(M + m), and using solar system units of years, AUs, and solar masses, the sum of the masses must be M + m = 1011 solar masses. The sum of the masses, in this case represents the total mass of the galaxy.

Answer to Question 2

A


silviawilliams41

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Reply #2 on: Jul 27, 2018
TY


InfiniteSteez

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Reply #3 on: Jul 27, 2018
You're welcome


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