Question

I'll give medal!!!
1. What was the original reason for identifying and naming nebulas?

2. Are all double stars binary stars?

3. How can astronomers tell if groups of stars actually form a star cluster?

Answer 1

@dan815

Answer 2

@sammixboo @UnkleRhaukus @bibby

Answer 3

@aaronq

Answer 4

I'm stuck on some of my science homework :/

Answer 5

@Ashleyisakitty