| A | B |
|---|
| constellation | group of stars that forms a pattern |
| absolute magnitude | amount of light a star actually gives off |
| apparent magnitude | amount of a star's light received on Earth |
| light-year | distance light travels in one year; 9.5 trillion km |
| photosphere | lowest layer of Sun's atmosphere |
| chromosphere | layer of Sun's atmosphere above the photosphere |
| corona | outermost, largest layer of Sun's atmosphere |
| sunspot | areas on the sun that are cooler, less bright |
| nebula | large cloud of gas and dust where stars are formed |
| giant | hydrogen depleted, core contracts, outer layer expands |
| white dwarf | formed when star core depletes its helium |
| supergiant | star's core heats up, heavy elements form; expands & explodes |
| neutron star | collapsed core of supernova. Contains only neutron in core. |
| black hole | final stage in evolution of massive star. Nothing escapes. |
| galaxy | large group of stars,dust, & gas |
| Big Bang Theory | universe begain with huge, fiery explosion |
| parallax | apparent shift in position of object when viewed from 2 different places. |
| Polaris | north star |
| radiation zone | sends heat out from the core of the sun |
| convection zone | circulates the sun's heat |
