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We believe that the solar system formed from an enormous cloud of dust (blown into space by the supernova explosions of dying stars) and gas (some original hydrogen that had been floating around in space since the "Big Bang", and some gas from those exploding stars). So the solar nebula (that's the name for the cloud of gas and dust) was even before the solar system became "solar".

We suspect that some external shock wave (probably one of those supernova explosions) triggered the gravitational collapse of the gas cloud. When enough gas had fallen to the center, it generated enough heat and pressure to form a star. So the star was the first thing in the "solar" system.

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10y ago

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