- #1
Pupil
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So my first question is, how do we know how many stars are in our galaxy? And the second is, how do we know the big bang started with a singularity (as opposed to, say, the universe being a few light years wide and then start expanding 13.7 billion years ago until it reached our present size)?
The reason I ask is, I was watching this History channel video on the Big Bang called The Universe (http://www.youtube.com/watch?v=D6CXsvNGkhg&feature=PlayList&p=8AB46D948616D856&index=0), and though I knew a bit about the big bang and the number of stars we think there are, I have no idea why we think so. Kind of embarrassing.
The reason I ask is, I was watching this History channel video on the Big Bang called The Universe (http://www.youtube.com/watch?v=D6CXsvNGkhg&feature=PlayList&p=8AB46D948616D856&index=0), and though I knew a bit about the big bang and the number of stars we think there are, I have no idea why we think so. Kind of embarrassing.