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Stellar Evolution Briefing

When our Sun was a dust cloud, it stretched 2 light years

To initiate nuclear fusion, the temperature rose to 15 million degrees

After exhausting hydrogen fuel, it will expand 10-100 times to be a Red Giant

After exhausting mainly helium fuel, it will collapse to a few thousand miles (white dwarf)

Larger stars that supernova explode an iron core, then collapse to a neutron star

A teaspoon of a neutron star would weigh billions of tons
Credit: NASA

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