From Mark Anderson at New Scientist:
Fresh suspicions have reopened the case against dark matter, forcing a fundamental rethink of the familiar force that keeps our feet on the ground
But what if we never really knew gravity at all? What if out there, beyond where we can easily keep our eye on it, the universal force doesn’t stick to the rules? (paywall) More.
It’s hard to know what to make of the question. Whatever gravity does is the rules.
See also: A proposed dark matter solution makes gravity an illusion
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