Isn’t this idea included or a product of the Big Bang Theory?
The second part of the question is, how come there are new galaxies being discovered if the universe is expanding faster than the speed of light?
Does light travel an infinite amount of distance? Isn’t luminosity or intensity of light a thing?
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Observing the Red Shift (kind of like visual doppler effect) we can see objects closer to us are moving away at a smaller relative velocity than objects further away. This tells us that the universe is expanding.
>The second part of the question is, how come there are new galaxies being discovered if the universe is expanding faster than the speed of light?
Because the Universe is really bloody big
>Does light travel an infinite amount of distance?
Effectively, yes
> Isn’t luminosity or intensity of light a thing?
Yes. The amount of visible light refracted does indeed drop off after distance and amount of light, but photons can travel pretty much forever.
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