[VeilEm]

This didn't mention the expansion of space at all. The universe may be infinite in size but we'll never see the light of stars that exist so far from us that they are beyond the distance at which space expands faster than light can travel. That's why we have a dark sky and it will just get darker as more things we see now eventually expand beyond that barrier. One suggested end to the universe is the Big Rip in which all matter eventually separates in this way such that the distance between all matter is infinite:

https://en.wikipedia.org/wiki/Big_Rip

[paulddraper]

Yep. Currently, some galaxies are traveling away from us faster than light.

http://curious.astro.cornell.edu/about-us/104-the-universe/c...

[joering2]

That blew my mind! So now it turns out Einstein was wrong??

We can't get particle to seriously travel faster than light and there is entire galaxy going faster??

[ranko]

The expansion of the universe also leads to red shift of the light from (nearly) all the stars that we'd otherwise expect to see. This means that the frequency of their light is moved away from the range that our eyes can see.

[platz]

My understanding of the expansion of space is that the expansion doesn't occur locally, but is only noticeable over large distances. is that incorrect?

[paulddraper]

It occurs everywhere, proportionally. The effect isn't great enough to notice unless you are looking at light-years.

Also, gravity and electromagnetism increase at close proximity, so on less-than-cosmic scales, they overcome the minute amount of spatial expansion.