Which statement correctly describes the role of gravity in galaxy ...

[crobinson2013]

Which statement correctly describes the role of gravity in galaxy formation?
 
  A) Gravity makes the universe more uniform and smooth than it was at the beginning.
  B) Gravity makes galaxies spin.
  C) Gravity makes the dense regions denser.
  D) Gravity slows down photons so they collect into galaxies.

Question 2

The resolution of a 10-meter telescope is about 0.01 arcsecond for visible light. Would you expect the angular resolution of a 10-meter radio telescope to be better than, equal to, or worse than 0.01 arcsecond? Explain.
 
  What will be an ideal response?

[micaelaswann]

Answer to Question 1

C

Answer to Question 2

It would be worse than 0.01 arcsecond because radio waves have much longer wavelength than visible light, and hence poorer angular resolution for the same size telescope.

[crobinson2013]

Gracias!

[sailorcrescent]

Excellent