Let's say our distant descendants in the year 3000 want to know exactly how the Egyptians built the pyramids, or what Julius Caesar looked like, or something like that. And let's say they have wormholes or hyperspace travel or something else that moves them faster than light.

If they head to a star 3050 light years away from Earth, a star that the light from Julius Caesar's day would just be reaching, would it be possible to build a powerful enough telescope to take a high-quality photo of Caesar and all the other events going on around that time?

If these descendants' telescope technology were as perfect as the laws of physics allow, how big would the telescope have to be to pick up human-sized details from that range?