Titan is an interesting moon because: A) beneath its clouds, ...

[pane00]

Titan is an interesting moon because:
 
  A) beneath its clouds, Titan may be Earth-like, with liquid water.
  B) the Huygens rover has sent back images of sedimentary rocks there.
  C) it has a rich atmosphere that may resemble that of the early Earth.
  D) it is known to have ice volcanism on its surface.
  E) All of the above.

Question 2

Why would galaxies colliding in a small cluster tend to stick together, while galaxies in a large cluster tend to pass through each other?
 
  What will be an ideal response?

[Jossy]

Answer to Question 1

C

Answer to Question 2

In a small cluster the lower mass means there is a smaller gravitational force pulling the galaxies together, which results in a lower collision speed. The greater mass in a large cluster results in a higher collision speedhigh enough that the individual galaxies don't slow down enough to merge.

[pane00]

Thank you!

[Jossy]

Always glad to help...