ICYMI: A map of the solar system from 1846 shows the presumed orbit of Vulcan, a hypothetical planet that was invoked to explain a puzzling feature of Mercury’s orbit. https://buff.ly/2KrwU99 pic.twitter.com/IFWD49eLQ6
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For what it's worth: computational general relativity -- at, say galactic scales, is something which is painfully difficult to implement.