I have a "science-fictiony" idea that I haven't seen anywhere else yet. The idea is this: If we can see light from planets thousands of light years away, then we can see the past. Once our telescopes are good enough to basically do a "google maps" zoom-in on other planets, we will be able to watche the past on other planets. But then, if we can ever watch our own Earth from a thousand light years away, then we can se…
Here's an even crazier version: we develop a quantum computer the size of Jupiter with seemingly infinite computational capacity, and "scan" and simulate the earth. Similar to how a sufficiently advanced AI application today could probably take an overview picture of a pool table at any point in a game, and deduce the past shots that had to be taken in order for it to result in it's current state, you might be able t…
If we consider that only simulating the atoms contained within the Earth is enough to have a perfect understanding of it's state across time, by logical conclusion simulating a house would be enough to rewind the history of it's structure.