posted on May, 6 2012 @ 08:45 PM
I can't tell you what "they" would see on a planet 6 billion ly from here. They may have different senses than ours, or use different instruments
to look at things.
But we can make an educated guess of what YOU would see from that distance looking back to here. You would not see our sun. It didn't exist then.
Instead, you'd see the interstellar gasses that eventually made up our sun and planets. Our sun is about 5 billion years old, so light from it has
only traveled that far.
But only if you had much more advanced tech than we have. We can't look at individual stars that far away.
Further than that? Depends on how further you are talking about. Once you get to about 13 billion light years, you won't see anything, at least in
the visible spectrum. There was no light, as stars didn't exist at that point. You'd have to change your instruments from the visible, to radio, and
what you would see is a lot of energy left over from the Big Bang, cooling down.
Further than that? You can't. There would be nothing for you to see, as nothing existed beyond that. Our universe had not been born yet.
Keep in mind, when you look up at the night sky, you're looking back in time. Light from the closest star takes just over 4 years to get here. If you
were at Sirius and looking back here at the Earth, you'd see things from just over 8 years ago.
If you were at Betelguise, looking at the Earth, you'd be seeing it as it was during the 1400's
If you were in the Andromeda Galaxy, you'd be seeing things back here as they were well over 2.6 million years ago.