Extinction Level Events

[Umbran]

The "not all your eggs in one basket" approach. You can't wipe out humanity, if humanity isn't just in one place. Unless we're talking solar expansion (maybe 3-4 billion years in the future), or a rogue black hole. L5 colonies, Io, Mars..... Spread the wealth.

Yeah. Spreading out in our solar system won't save humanity from things that have impact on the scale of the solar system - the Sun's eventual expansion, or nearby supernovae giving anyone without SPF 1,000,000 a really bad day, f'rex. But it is good for most other things.

L5 colonies are not really safe unless you pair that with asteroid mining. Long term survival requires the ability to acquire resources.