When aliens in galaxies 70 million light years away look through a telescope at Earth, they see dinosaurs.
Is that why there has been no alien contact? Because as far as aliens are concerned, there is legitimately no intelligent life on earth?
Can someone explain this to me why are they seeing things in the past I’m dumb
You aren’t dumb! The reason is because when we look out into space we see billions of lightyears away. Since a lightyear is the time it takes for light to travel in one year, by the time the light reaches us it’s been billions of years since it was reflected. If that’s true then the opposite should work, where the light reflected off our planet is older the further you go out into space. I think that’s pretty neat!