Two stars that appear close to each other in the night sky.
A) are always part of the same cluster of stars in space.
B)must both be moving in the same direction
C)are gravitationally bound
D)may actually be quite far apart
I think D is not correct, Im not sure about B, if B D are not correct then left A and C. Which one?

Question

Two stars that appear close to each other in the night sky.
A) are always part of the same cluster of stars in space.
B)must both be moving in the same direction
C)are gravitationally bound
D)may actually be quite far apart
I think D is not correct, Im not sure about  B, if B D are not correct then left A and C. Which one?

anonymous · Answer

It's a binary system, they will be orbiting around a common mass.

anonymous · Answer

Centre of mass I should say

anonymous · Answer

This question is very vague though

anonymous · Answer

I googled binary stars but couldn't find source that clearly states whether they're are gravitationally bound or are always part of the same cluster

anonymous · Answer

Well clusters are massive, and if these stars are together, they have to be in the same cluster which is a group of stars that are gravitationally bound

anonymous · Answer

I wonder what they mean by "close"

anonymous · Answer

Mhm will it tell you the right answer soon as you answer it?

anonymous · Answer

I guess go with C

anonymous · Answer

Because I'm thinking it is a binary system

anonymous · Answer

no its a paper assignment

anonymous · Answer

its not like Webassign or Mastering physics...:(

anonymous · Answer

yeah Im guessing its C
Thanks!!

anonymous · Answer

Alright :), hey when you get the answer back, do you mind posting it here? Thanks

anonymous · Answer

sure! will do!