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'Still' with respect to what?
With respect to everything else.
QuoteWith respect to everything else.Do you mean the 'centre of mass of everything else'?'Cos everything else is on the move, individually, relative to all the rest..IF you go along with that idea, the thing that was at rest would have to be an isolated particle - say a proton - because, in an object (many atoms) the atoms are all vibrating.Anyway, I thought we had, recently, established that there isn't really a centre to the universe - so how can there be a centre of mass? The centre of mass would be anywhere you chose - so, something there (i.e. anything anywhere) could be looked upon as stationary. Go on - sort me out.
Is anything in the Universe ' still '....?.