Are There Infinitely Many Stars?
Most recent answer: 07/12/2015
- Tomas Gavi?o (age 32)
Your great question about how the sky seems like it should be lit up if there were an infinite number of stars is called "Olber's paradox" (). It goes back to at least Kepler in 1610.
We actually don't know if the universe is finite or infinite. We do know that distance stars are receding from us, That makes the light from them Doppler shifted, and for fast enough speeds it's Doppler shifted out of the visible range. So even if the universe is infinite, we only see visible light from a finite part.
Here's an old discussion of the same question: /
(published on 07/12/2015)