Is it possible to mark everything in the universe, if so how?

[Derkylos]

No. If you are viewing stuff from Earth, you cannot view most of the things. This is because the light ( information ) about the object has not reached us yet.

Another reason for this is that light travels slow. The closest galaxy to us is the Andromeda, and it takes 2.5 million years for its light to reach us.

What about things older than 4.5 Bilion years ? The Earth hadn't existed at that time so no light can reach us from those objects who existed longer and prior to Earth's creation ( Do not mix this with Bible or Kur'An or any other holy book ).

You can see anything less than around 13 billion light years away, given that this is the best approximation of the age of the universe.

Yes, you can see objects more than 4.5billion years old, but they will appear to be at an age relative to their distance. (yes, the light emitted by them before the earth was formed would have passed through the space where the earth would be, but things (re: stars) are constantly emitting light, and the light they emitted 4.5 billion years after the light which passed through the space where the Earth was yet to be can now be seen (note, this is not a comment on when the light was emitted with respect to now))

Even the sun is not in the state it appears to us to be in, because the light takes some 8 minutes to reach our eyes.

Argh. discussions about light/time/universe are hard to explain properly.

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