Why redshift of light occurs between galaxies only?
3108
Why does space expansion not expand matter?
45057
How far away must a galaxy be for its light never to reach us due to the expansion of the universe?
42765
Stimulated emission and No cloning theorem
10377
Is redshift the only way by which we can tell that space is expanding?
92978
Distance from redshift
56079
Do two beams of light attract each other in general theory of relativity?
130255
Why doesn't a typical beam splitter cause a photon to decohere?
64734
Distribution of Dark Matter around galaxies
39242
Why can't we see light travelling from point A to B?
49047
Redshifted Photon Energy
20427
Is there an infinite amount of wavelengths of light? Is the EM spectrum continuous?
13563
What really causes light/photons to appear slower in media?
156818
Doppler Shift when Light Travels Through Two Different Mediums
27820
What's wrong with this experiment showing that either FTL communication is possible or complementarity doesn't hold?
53008
Why do sunbeams diverge even though the sun is much more than a few kilometers away?
61729
If turning a perfectly monochromatic laser on for a finite time gives a frequency spread, where did the other frequency photons come from?
76365
Why do galaxies "disappear?"