Most people never stop to think that all the stars visible in the sky have already died off millions or even billions of years ago.
When astronomers capture a supernova with a telescope for instance, it is billion of light years away and thus the light waves traveling from that supernova that we see today probably occured before the earth or our solar system ever existed.
The current theory is the entire universe is about 14 billion years old. And thats a theory based on mathematical equations and will change just as all science has in all history. The leading edge says there are at least multi-verses and possibly infinite universes.
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