http://www.smbc-comics.com/comic/best-3
Alt text
The only possible problem is if being crushed in a universe-ending sea of flesh would make it no longer be the best day ever.
Bonus panel
http://www.smbc-comics.com/comic/best-3
The only possible problem is if being crushed in a universe-ending sea of flesh would make it no longer be the best day ever.
About 117B people have ever lived[0]. If we assume that they were all chunky and weighed 100kg, and that they all had access to time travel, then that’s a total mass ~ 120e12 kg, which is 0.00000000000000006 Solar Masses (where 1SM = 2e30).
Feeding that mass into a Schwarzschild radius calculator[1], gives an event horizon of 1.78e-13 m, or about the size of 1 single atomic nucleus. The gravity would be 2.5 m/s².
The universe ain’t going nowhere.
0: https://www.prb.org/articles/how-many-people-have-ever-lived-on-earth/
1: https://www.omnicalculator.com/physics/schwarzschild-radius
this is making the key assumption that the number of people that exist in the future is the same as the number of people that lived up until now, which seems unlikely. A bigger issue Id think is that if the universe ends (or really just the world, the universe is overkill), then all those time travelers from the future never can exist to do this in the first place, making this a classic time paradox.
I think it still works. If you increase the number of humans by 6 orders of magnitude, it still seems unlikely to form a black hole big enough to be an issue
Humans? How arrogant of you (<3) to assume that only humans exist and only they have access to time travel.
Add aliens (and artificial lifeforms) to the mix and watch the universe implode!
Plus the mass of time travel devices.