How a black hole forms and what happens at the edge

Process map by Brian. 14 steps, 2 layers. Tags: space, astronomy, physics.

1. A massive star: A star more than 20 times the Sun burns through its fuel
2. The core: Fusion stops and the core can no longer hold itself up
3. The core: The core collapses in a fraction of a second
4. A massive star: Outer layers blast off in a supernova
5. The core: Is what is left heavier than about 3 Suns?
6. The core: Gravity crushes it into a point: a black hole
7. Space around it: Nothing, not even light, escapes inside the event horizon
8. Space around it: Gas falling in heats up and glows, so we can see it
9. Space around it: Two black holes spiral together and send gravity waves across space
10. The core: It becomes a neutron star instead

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