Question

What is the name for galaxies held together by gravity?

A.
solar system

B.
constellation

C.
binary system

D.
cluster

@petiteme

Answer 1

I would think D.. I'm not sure though. :(

Answer 2

That's what I thought too. Not sure though :o

Answer 3

"Clusters appear to be collections of galaxies held together by mutual gravitational attraction."

Answer 4

Ah so it is D. :o

Answer 5

Hahahaha we therefore conclude, it is D! xD

Answer 6

Thank you so much for your help! xD You earned a fan! :)

Answer 7

Thank you!