Why is the night sky not completely white ?
In: 10
Two main reasons.
1. However far a star is away from us, it takes time from the light of that star to reach us. So there are stars that are so far away that their light hasn’t reached us yet.
2. The universe is expanding, and the rate of that expansion increases the further away you get. This creates a kind of “horizon” beyond which no light from anything past it can ever reach us, because it is expanding away from us faster than the light is approaching us.
Latest Answers