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What is a star?


Look up in the night sky and you'll see lots of stars. But what is a star?

In a scientific sense, a star is ball of hydrogen and helium with enough
mass that it can sustain nuclear fusion at its core. Our Sun is a star,…

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as much energy as the Sun. It has probably only lasted a few million
years and will soon detonate as a powerful supernova destroying itself
completely.

Most stars are in the main sequence phase of their lives, where they're
doing hydrogen fusion in their cores. Once this hydrogen runs out,…

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