![]() Light from beyond the Hubble sphere (the place where recession velocity equals the speed of light) reaches us daily. Red-shift is measured as the change in wavelength of the light, but rather than interpreting the results using special relativity (which would result in $vphoton emitted from a galaxy moving away from us faster than light, initially is also receding from us. If recession velocity at the location of a traveling photon were greater than the speed of light the entire time the photon from a distance galaxy were traveling, we would never observe the photon. ![]() In summary, Hubble Law: $v = H(t)D$, where $v$ is recession velocity, $D$ is distance, and $H(t)$ is the Hubble "constant" at a given time, requires that beyond a certain distance velocity is greater than the speed of light. The following papers give good explanations: We know that some galaxies are moving away from us faster than the speed of light and we know it by measuring the redshift, but how's that possible?
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