Portal:Speculative fiction/Possible futures

Possible events in the future as suggested by science fiction:

• 40,000 humans are exiled from Earth in 2309.

• A second nuclear holocaust destroys all life on Earth in 3782.

• In the year 500,000,000,000,000,000,000 (500 quintillion), the last descendants of humanity make some changes to our near present in order to release the universe's vacuum energy, spawn new universes, and prevent the Big Freeze from happening.