Technically the visible universe extends only about 13 billion light years from us. We can just calculate where that stuff is now because of expansion. And as I wrote the area we’re aiming for will surely change drastically the further away it is.
These journeys wouldn’t take billions of years for someone traveling near light speed because for them the lengths would shrink down so much that they’d be negligible. Of course once they had slowed down those billions of years will have gone by for everything outside the space ship. So it’s not good for missions where you want to return home to your family afterwards.
Technically the visible universe extends only about 13 billion light years from us. We can just calculate where that stuff is now because of expansion. And as I wrote the area we’re aiming for will surely change drastically the further away it is.
These journeys wouldn’t take billions of years for someone traveling near light speed because for them the lengths would shrink down so much that they’d be negligible. Of course once they had slowed down those billions of years will have gone by for everything outside the space ship. So it’s not good for missions where you want to return home to your family afterwards.