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?
In: 7
Yes. It’s as plain as day. There’s simply no other explanation for what we observe.
>Isn’t this idea included or a product of the Big Bang Theory?
Yes
>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?
Not sure what you think the connection is here. Our ability to detect extremely dim, far away galaxies with better telescopes isn’t related to the rate of expansion of the universe.
>Does light travel an infinite amount of distance? Isn’t luminosity or intensity of light a thing?
Light will travel forever unless and until interacts with something, whether that be 5 meters or 5 billion light years. In our expanding universe, light gets redshifted as the universe expands, but it doesn’t stop existing unless and until it interacts with something. Luminosity isn’t the correct term, but if you mean “light from far away is less bright”, yes, that’s true because light spreads out as it travels so less of it hits the same area, but again, it still exists, it’s just spread out more.
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