- TL;DR Summary
- How can we receive light from an object 10 billion light years away? Since the universe is expanding, wouldn't that source have been a lot closer to us 10 billion years ago. Meaning the light would have already reached us?
Given that the universe is expanding, and we currently believe the universe as we know it began a little over 13 billion years ago, Then when we look at a distant object and say we are looking light from 10 billion years ago, How is that possible. With the universe expanding for 13 billion years, then 10 billion years ago we all would have been closer together. And the light would have been coming from much closer and therefore would have already reached us.