[jcranmer]

> To have the species survive if anything ends all life on Earth

Nothing the universe has thrown at Earth in the past 3 billion years has been capable of ending all life. And nothing that could happen in the next million years seems possible of doing that either.

[pretendscholar]

When we say life on earth we mean human life and civilization. Prokaryotes, while alive, are not really what people mean. Yes they would survive asteroids, nukes, possibly nanobot swarms.