| A | B |
|---|
| star | ball of gas |
| doppler effect | red shift or blue shift |
| light year | distance light travels in a year |
| parallax | used to determine distance to stars |
| apparent magnitude | how bright a star looks from Earth |
| absolute magnitude | how much light a star gives off |
| main sequence | longest stage of a star's life cycle, diagonal across HR |
| nebula | cloud of space dust and gas |
| giant | next step in the sun's life cycle |
| white dwarf | bright, dim star |
| nova | white dwarf too close to red giant: EXPLOSION |
| neutron star | rotates rapidly, SUPER dense |
| pulsar | emits radio waves |
| black hole | HUGE gravity |
| constellation | stars that form a pattern when seen from Earth |
| galaxy | billions of stars held in place by gravity |
| quasar | related to galaxies |
| background radiation | energy evenly distributed around universe |
| red shift | object moving awat |
| blue shift | object movong towards |
| dark energy | opposes gravity |
| dark matter | gives off no light |
| protostar | disc shaped spinning |
