They're Already Gone Forever. And We Can Prove It

本站添加: 2026-05-22

[00:00:03]The universe is expanding.

[00:00:05]Not into anything.

[00:00:07]>> [music] >> It's the space between galaxies that stretches, and it's accelerating.

[00:00:12]Right now, galaxies beyond 46 billion light-years >> [music] >> are receding faster than light itself can travel. That means their light will never reach us. [music] They are gone. Not destroyed, just permanently beyond any possible contact.

[00:00:27]And here's what that actually means.

[00:00:28][music] Every second, more of the universe crosses that horizon.

[00:00:34]Objects that were reachable a billion years ago aren't anymore.

[00:00:38]We are slowly losing the observable universe, not [music] in some distant future.

[00:00:44]It's happening right now, while you watch this. The question isn't what's out there.

[00:00:49]>> [music] >> Huh. The question is, how much have we already lost?

[00:00:54]>> [music]