There's a common QnA which has amused and inspired many kids:
There are billions of Stars in the sky. If we combine lights received from all stars, wouldn't it beat Sun? Why is night dark really?
It's because speed of light is finite and lights from most of stars are in the way to the Earth.
My Question: If universe didn't expand faster than light in any point of time, would our nights brighter like day?
Common sense says, Yes. But, unfortunately, universe is full of common sense busters. Is there anything else which can affect this?
Note: I am talking about visible light only. I know, night is already bright in other wavelengths.
I am clarifying the behavior setup of universe in If clause:
Universe expansion speed is calculated classically with Super Cluster Red Shift. No GR globally separated reference frame glitch here.
Universe is expanding today, but not accelerating. Similar to original Hubble's discovery except Inflation shouldn't accelerate universe to faster than light.
My common sense reasoning:
After universe became transparent to light, all luminous objects should continuously illuminate possible position of Earth until their death. As universe is young, death probability should be low.
Till the time of birth of Earth and till today, light from most of slightly younger stars should reach Earth for continuous illumination.
This is the reasoning of my common sense.
If I am still not clear, let me know.