Is it possible to see the past

They would see the Earth as it was in 2007.

The entire night sky is a photographic map of varying age and distance. The farther away an object, of course, the older we see it, and this allows us to observe the development of galaxies. Some of the most distant galaxies photographed show formations not quite as elegantly shaped as the newer and closer ones. It takes time for galaxies to get their beautiful spiral or ring forms.

Just look at any star. The distance in light years is how many years ago you are seeing.

2007 because it takes 4 years for light to travel to them.

it would take light 4 years to reach that planet, so yes they would see 2007 earth

2007 gee

The answer is that, yes, they would be seeing the images that left the earth 4 years ago.

That is, however, only theoretically possible. We do not have telescopes that are large enough to see things on the moon such as the remnants from the 6 lunar missions. The moon is only a tiny fraction of the distance you are talking about.

There are (at least) two problems. The light that reflects from a planet is really a very tiny amount when compared to what comes from a star, and it will dissipate very quickly in space, so that earth could essentially be invisible at that distance. When astronomers on earth detect planets around other stars, they are most often detected by watching for gravitational effects on the sun they orbit rather than by seeing reflected light.

The telescope that you would need to be able to see anything on earth would be - pardon the pun - astronomically large. Really. Many _miles_ in diameter. For us, with our technology, constructing such a telescope would be impossible.