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What would an alien looking at earth through a telescope see if he were located on distant planet?

 
Anonymous Coward
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07/04/2013 08:37 AM
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What would an alien looking at earth through a telescope see if he were located on distant planet?
The greater the distance between places in the universe, the earlier in time we can see. For example, it's possible to study the early stages of the universe because we can see them through our most powerful telescopes.

So, right now in those far away universes that we see as being primordial, things no longer exist as we currently see them. A lot of what existed no longer exists. Stars have lived out entire life cycles. Solar systems have been born, lived and died; perhaps forming new solar systems altogether..

My point is, right now at this exact moment of our time, we can see their past.

So let's say aliens are looking at earth through a telescope on one of the planets that now exist in the furthest reaches of visible space. What would they see? Would they see anything at all?
Anonymous Coward (OP)
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07/04/2013 04:17 PM
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Re: What would an alien looking at earth through a telescope see if he were located on distant planet?
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Anonymous Coward
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07/04/2013 04:36 PM
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Re: What would an alien looking at earth through a telescope see if he were located on distant planet?
It would take an optical telescope with a mirror approximately 2 astronomical units in diameter to capture enough photons to reconstruct a grainy low-quality B&W image of Earth's history, similar to the quality in a cheap CCTV.

If we could construct one in our solar system, and somehow accelerate this faster than the photons traveling away from Earth, we could literally turn around and watch our own history, from that frame of reference.
Anonymous Coward
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07/04/2013 04:49 PM
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Re: What would an alien looking at earth through a telescope see if he were located on distant planet?

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