| A | B |
|---|
| Stars | Spinning clouds of Gases with Nuclear Fusion (92) |
| Nuclear Fusion | Radiates heart and light by changing hydrogen to helium (92) |
| Stars are made | By gravitational attraction of gases in a nebula (93) |
| Protostar | When contracting nebula starts fusion, beginning a star (94) |
| Star Lifecycle | Nebula, Protostar, Main sequence, Giant, White Dwarf, supernova-neutron star / black hole (95) |
| Massive stars | Turn into black holes, supernova, or neutron stars (96) |
| Smaller stars | Cool to become white or brown dwarfs (96) |
| Faster Life cycles | Belong to large mass stars rather than smaller ones (97) |
| Spectrscope | Instrument to analyze light (98) |
| Spectroscopy | Analyzes spectrum of light from star to find information (99) |
| Doppler Effect | Increase in frequency as two objects shift toward each other, vice versa (100) |
| Edwin Hubble | Used Doppler Effect to find out that the Universe is expanding (101) |
