Help with astronomy homework!?

Lpgg

New member
Hi,

I'm an awful procrastinator and was wondering if maybe someone could help me with these questions..? I'd really appreciate it!

1. Suppose the Sun were to be replaced with a black hole that had one solar mass. What effect
would this have on the orbit of the Earth? [It might help to read up on these things first.]

2. Is the composition of the interstellar medium about the same now as it was when the Sun was
formed about 4 1/2 billion years ago? Why or why not? How can you find out what it was like
then?

3. Why are B stars the brightest in open clusters? Why are red giants the brightest in globulars?
 
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