"Mr Jherek Chamaeleo" wrote in message
...
is it theoretically possible to sense from earth the qualities of the
light
that was reflected into space in the past from earth
could we focus on a certain distance in space say 1000 light years away
to
build a visual image of the past
First, we can't even 'see' a planet at stellar distances (for a nearby star,
let alone one at 1000 light years away), both in terms of the amount of
light reflected from a local star, and in terms of the resolution needed.
Then add the fact that you can't 'see' reflected light, until it reflects
off something else. Add the albedo of the surface involved, and the fact
that the distances involved then double (and the amounts of light then
'quarter' - good old inverse square law), and the answer is 'no'. Not even
close...

Best Wishes