I like this radius. It kind of explains why asteroids are lumpy and bumpy, kind of like potatoes, and yet planets and moons are smooth round balls. It seems that from about this size, the mass of the rock itself gets large enough that it is pulled in on its own gravity, and consequently starts to round itself off.
I learned about this from Brian Cox’s show Forces of Nature.
Not sure about asteroids, meteors and meteorites?
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