| A | B |
|---|
| Quasar | furthest known object |
| Black hole | gravity so intense not even light can escape(leave) |
| Red Giant | large, cool star |
| White Dwarf | small, hot star |
| Galaxy | group of stars all held together by gravity |
| constellation | group of stars with an apparrent shape |
| gravity | force of attraction between any two objects |
| absolute magnitude | the TRUE brightness of a star(object) |
| apparent magnitude | the OBSERVED brightness of a star(object) |
| main sequence | a line(on the H-R diagram) where most stars fall |
| H-R diagram | developed by Hertzsprung and Russell |
| Light Year | the distance that light travels in one year |
| Astronomical Unit | the average distance from Earth to the Sun |
| absolute magnitude | a measure of the amount of light a star or other space object actually gives off |
| asteroid | a piece of rock, smaller than a planet that orbits the sun |
| asteroid | pieces of rock that orbit the sun between Mars and Jupiter |
| astronomical unit | used for measuring distances to objects in the solar system |
| astronomical unit | 150 million kilometers(km) |
| black hole | the final stage in the life cycle of some massive stars |
| white dwarf | a late stage in a star's life cycle when its core runs out of fuel |
