[skykooler]

If you wait for the temperature to drop, and the universe is expanding, distant galaxies will recede to the point that they are now moving away faster than the speed of light and their matter is no longer available to contribute.

[Jerrrrrrry]

Intersection of light cones, the expansion of the universe, and the Margolus–Levitin limit of computation is truly the ultimate secret.

5 picoseconds to respond, then you are disconnected from the system by the laws of physics.

No amount of frame-jacking via time dilation using black holes can cheat that captcha, or brute force that keyspace.

By the time you find the key, we are no longer connected in space-time/causality

[mattigames]

Thank it is expanding now really means that it will expand forever? Are there not other physics at play that could stop that at some point, yeah I don't know much about any of this just wondering out loud.

[sushibowl]

This is generally unknown, of course. However it currently appears that the expansion of the universe is accelerating, i.e. it is expanding faster and faster.

Obviously it can't be ruled at that at some point this would stop and/or reverse. But there's no reason to think so, and if we're considering arbitrary future changes then we may as well consider that the universe might suddenly start heating up again in the future, or more mass will start appearing out of nowhere. Or god appears and hands out free decryption keys to everyone.

[contravariant]

Nothing says you have to wait with gathering, just wait a bit for the CPU to cool down before you start computing.

[skykooler]

Gathering matter into one place heats it up, and prevents it from cooling (more or less - the outside can cool but thanks to the square-cube law that's basically negligible on universe-sized masses.)