Seeing the Early Universe
Most recent answer: 05/15/2013
- Daniel Wynter (age 29)
The key point is that the type of things we see from that source depend on its age in its own reference frame, not some other reference frame we might choose. When the source was 750,000,000 years old in its own frame, it would be much older in a conventional extension of our usual local frame out that far. You can see that easily in a special relativistic calculation (which I can handle, unlike a proper general relativistic one). Objects moving away from us have, according to our frame, slowed clocks- the "time dilation" effect.
Your other question was whether some of the universe is moving away from us faster than c. The answer depends on what you mean by "our universe". It sure looks as if some stuff that is part of the same mathematical object as us got inflated to moving away faster than c, departing past the horizons of our visible universe.
(published on 05/15/2013)