Come On Giant Asteroid!@scott @VE3RWJ @HopelessDemigod
And all redefined in the past decade. No more "standard kilogram" kept in a vault! OK, that hasn't been the basis for measuring mass in quite some time, but they did work to get it down to known, measurable, presumably immutable quantities. WAY above my pay grade so had to hum through a lot of it but so much better than the "length of the King's" whatever.
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