I can't imagine the size of object that formed the Valhalla crater on Callisto. ... | Hacker News

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		AaronM on Sept 3, 2020 \| parent \| context \| favorite \| on: Earth's mountains form in millions of years, Moon ... I can't imagine the size of object that formed the Valhalla crater on Callisto. The central region is 360km across, and the diameter of the entire basin is 3,800km. That's a distance on earth from LA to Arkansas!

LeifCarrotson on Sept 3, 2020 [–]

And the whole equator of Callisto has a circumference of 15,100 km. Proportionately, that would be a basin the size of the Indian ocean!

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