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@The Chair Rapist, I minored in astronomy so I can help you out. What it is is that since stars are light years away and that's the amount of distance light travels in a year when you see something 1 light year away you are technically seeing it 1 year ago. The light we see if the light that left 1 year ago. So for stars that are 20 light years away we are seeing what they looked like 20 years ago. That's how you can technically see things in the past. So some of those stars you see may not even be alive anymore 😞
I literally do this about astronomy. Like, think about it. The stars you look up and see, and the far away galaxies are so far away that the light you are seeing from them is millions of years old. Meaning that you are looking into the past. Think about this also, if a mirror was in space at 100 million light years away and you could see it perfectly, you would be seeing the earth as it was 100 million years ago. I also ponder the fact that compared to the universe (as it is forever expanding) we are microscopic. Smaller than the smallest bacteria on earth relative to the the universe that is. We will never even get to explore these far away places in any of our lifetimes unless a wormhole is created (which seems impossible). What is really cool is that the probe Voyager 1 recently entered intergalactic travel (it left the solar system). On board it has a disc with music, greetings in 55 different languages, directions to find earth, etc. I love space/astronomy.