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Most of the planets probably formed within a million or so years of the time the Sun formed. That sounds like a long time, but for an astronomer that's a pretty short period.

Looking further out, it's entirely possible that several nearby stars were formed about the same time as our solar system. Some theories of stellar formation suggest that a stable nebula of gas and dust is unlikely to coalesce without some external impetus, such as the shock wave from a "nearby" supernova. And we know that our solar system was formed from matter blown into space by probably several previous supernova explosions. (Otherwise, there would be no heavy elements such as lead, gold, or uranium - elements only created in supernova explosions! - on the Earth.)

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14y ago

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