Quote:
Originally Posted by sir_pudding
We are able to observe quite a bit about the rest of the universe, including quite a large number of stars. Spectrography is a fairly well established observation technology, and is almost certainly reliable (if it isn't then then the universe is really weird (like Matrix-weird). The basic model of stellar nucleosynthesis pretty much can't be wrong; if it was discovered in a an earlier more arrogant time we would be calling it a Law of Nature.
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I think
this video is highly appropriate and adequately explains.