3 ms·
".. what does it mean for time to take time?" What does it mean for length to take length? If space expands doesn't that mean that a meter gets "longer"?
by jonsen 17y ago
".. what does it mean for time to take time?"
What does it mean for length to take length?
If space expands doesn't that mean that a meter gets "longer"?
- alxv 17y agoBut to an observer, a "longer" meter is sill a meter.
- jonsen 17y agoYes, and a "longer" second is still a second.
- dhimes 17y agoBut if you create something where a meter is shorter, then move it to where a meter is longer, you will have, for example, a photon whose wavelength you think you know (because you understand the process, say a hydrogen transition, that created it) have a slightly longer (red-shifted) wavelength.
- JacobAldridge 17y agoAnd given that a meter is defined by CGPM / BIPM as "the distance travelled by light in free space in 1⁄299,792,458 of a second", then when time takes more time length gets more length. http://physics.nist.gov/cuu/Units/meter.html http://physics.nist.gov/cuu/Units/meter.html