> do we account for velocity in determining whether light traveling at c towards earth will ever reach us?
As far as I know this is not necessary because the speed of light is constant regardless of the velocity of both the source and the observer (this is Einstein's special relativity: https://en.m.wikipedia.org/wiki/Special_relativity)
>> While objects cannot move faster than light, this limitation only applies with respect to local reference frames and does not limit the recession rates of cosmologically distant objects
Then the length traveled changes for two photons emitted when they cross the starting line at different velocities:
const d = distance = 1
# d_start = 0
# d_finish = d
c: Velocity # of a photon in a vacuum
v1: Velocity # of photon emission source 1
v2: Velocity # of photon emission source 2
v1 + c != v2 + c
distance / (v1 + c) ?= distance / (v2 + c)
((v1 + c)*t) - ((v2+c)*t) ?!= 0
Should (v + c) be prematurely reduced to just (c), with a confirmed universal expansion rate?
As far as I know this is not necessary because the speed of light is constant regardless of the velocity of both the source and the observer (this is Einstein's special relativity: https://en.m.wikipedia.org/wiki/Special_relativity)