4 ms·
It has the unit-dimension the same of acceleration (that is [Length]/[Time]^2), so it should be read as: 'Every year, the velocity of the distant quasars (goin
by rotorblade 12y ago
It has the unit-dimension the same of acceleration (that is [Length]/[Time]^2), so it should be read as:
'Every year, the velocity of the distant quasars (going away relative us) is increased by 1 cm/s.'
- kordless 12y agoCould there be a similar observation of this if time were slowing slightly?
- jdmichal 12y agoI don't see how. Also, what would "time slowing slightly" even mean? That is, what frame of reference is time slowing against? How would we even measure that effect, given that all of our tools which measure time do so my detecting a fixed interval of it passing? Intervals which would also be "slowed".
- kordless 12y agoTo be more specific, if our reference time were slowing slightly, where 'our' is defined as all humans and devices making the measurements.
- wiml 12y agoI think our time would have to be slowing different amounts w.r.t. objects at different distances from us. This would imply a Universe-wide effect on the rate of passage of time which is coincidentally centered on Earth, or at least on our group of galaxies. Universal expansion has the advantage that it doesn't require the Earth to happen to be at a special privileged point in the cosmos.