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| Pregunta | Respuesta |
| 1 | Nebula - a cloud of gas that forms a star. |
| 2 | Protostar - a cloud of gas becomes so compressed that the heat makes it glow. It then forms a protostar. |
| 3 | Main sequence - hydrogen nuclei get close enough to undergo nuclear fusion. Star can now stay stable for billions of years. |
| 4a- Massive stars | Red supergiants - stars run out of hydrogen. Outward pressure doesn't balance gravitational pull. The stars core collapses, outer layers expand. |
| 5a- Massive stars | Supernova - at the end of the red supergiant's life they collapse rapidly and then explode. Outer layers of gas are thrown off while the core continues to collapse. |
| 6aa- most massive stars | Black holes - gravity pulls the cores of massive stars together to form black holes. Black holes are so dense that light can't even escape them. |
| 6ab- massive stars | Neutron star - if remains are not dense enough to form black holes, a small, very dense, neutron star is formed. |
| 4b | Red giants- - stars run out of hydrogen. Outward pressure does balance gravitational pull. The stars core collapses, outer layers expand. |
| 5b | White dwarf- when the core collapses it forms a white dwarf. No more fusion can take place, the star gradually cools over billions of years. |
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