One type of time travel that happens daily is seeing into the past: Light’s speed is limited, so the Universe is full of images from distant eras. A few of everyday examples are:
- We see the Moon as it was 1.5 seconds ago.
- We see the Sun as it was eight minutes ago.
- We stars as they were up to 13 billionyears ago.
So here’s a thought: If we could locate a huge reflective surface 32.5 million light years away*, and focus an incredibly powerful telescope on it, we could see the dinosaurs.
Although re-watching Jurassic Park would be simpler...
*32.5 million yars for the image of Earth to reach it, and 32.5 million years for the light to be reflected back equals 65 million