[ELi5]If the universe is full of stars why is it so dark?
In: Physics
Imagine your room filled with about a 100 fireflies. They produce light, but your room will still be dark because the intensity of their light pales in comparison to the size of your room.
It is the same case with the universe, although the galaxies are huge, and the stars they have produce enormous amounts of light and energy, it just pales in comparison to the size of the universe.
Also, even if your room has 100 firefiles, it will not be a lot, because there is still more than 99% empty space.
Similarly, although there are a lot of stars, more than 99% of the universe is still empty.
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