I'd never heard of the 'Wandering Jupiter' aka the Grand Tack hypothesis until a few months ago. If anything like it is true, there could have been planets or planetisimals of substantial mass between Mars and Jupyter. But this would been coeval or even slightly prior to the formation of Earth (turns out the inner four were formed after five and up.) Oh, the things you learn.
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Date: 2024-04-12 02:09 am (UTC)