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The theory for our solar system is that the solar wind blew the lighter elements out beyond 3 astronomical units. The inner planets coalesced out of the heavier elements that remained.

Most of the solar systems we have found so far consist of large gas giants orbiting close to their primary star, so this theory does not account for that.

When you look at the rocks in a creek, you notice that some are smaller and some are larger. Lots of them are very small, and a few tend to be very large. There is no reason they should all be the same size.

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13y ago

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