4 ms·
How is that the radius of the observable universe? I thought the observable universe was bounded by the age of the universe, which why the furthest distant obse
by rquantz 12y ago
How is that the radius of the observable universe? I thought the observable universe was bounded by the age of the universe, which why the furthest distant observations show the universe close to the time of the Big Bang. Shouldn't the radius of the observable universe = the number of years light has been traveling toward us?
Edit: Wikipedia says I'm wrong about this. What's new?
- yk 12y agoThe radius of the observable universe is the distance the furthest stars we could theoretically observe today.[0] So these stars were a lot closer earlier and we can see the light even though the stars are further away than the age of the universe (times the speed of light). [0] Technical details omitted.
- vidarh 12y agoThe universe has been expanding. So the distances now are vastly larger than they used to be when the light left its sources.