Kurzgesagt : TRUE Limits Of Humanity – The Final Border We Will Never Cross

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>We have no idea what these galaxies look like today and *we will never know*

>A being born in the far future in Milkdromeda will think that the universe consists of nothing but its own galaxy. When they look far into empty space, they will only see more emptiness and darkness. They won't see cosmic background radiation, and *they won't be able to learn about the Big Bang*

How can they know for certain that knowledge is unattainable?
Isn't the wave function supposed to preserve information?