Light travels at a finite speed, so when we look at far away objects we are seeing what they looked at in the past, when that light first left them. The farther away an object is, the further into the past we are looking.
Light travels at a finite speed, so when we look at far away objects we are seeing what they looked at in the past, when that light first left them. The farther away an object is, the further into the past we are looking.