What can cause and count as human civilization collapse;

1. AGI: Artificial intelligence could turn against human interests.

2. Ecological Collapse: Climate change could radically change Earth's populations.

3. Nuclear War

4. Global Pandemic

5. Widespread Economic Collapse

Self-sustaining communities beyond Earth, whether on other planets, moons, asteroids or in artificial space habitats will count as multi-planetary species status. These communities should be able to sustain themselves completely independent of Earth. A measure could be if Earth is annihilated those communities should be able to exist comfortably.