| A | B |
|---|
| nuclear fusion | star's energy process |
| star | huge sphere of gas in space that gives off great amounts of heat and energy |
| solar system | any number of planets, moons and other objects that orbit around one or more stars |
| constellation | small group of stars that form an imaginary pattern in the sky |
| outer space | outside the earth's atmosphere |
| distance | a light year measures this |
| Milky Way | our galaxy |
| red | color of the coolest stars |
| parallax | shift of position an object seems to have when viewed from two different points |
| astronomy | scientific study of objects in space |
| absolute magnitude | true brightness |
| apparent magnitude | brightness that appears from Earth |
| blue | color of the hottest star |
| red giant | large cool star, next stage for our sun |
| nebula | cloud of dust and gas where stars are born |
| hydrogen | the more a star has of this gas, the younger its age |
| super nova | exploding star |
| black hole | an object whose gravity is so strong, light cannot escape it |
| black dwarf | dead star that no longer gives off any light |
| white dwarf | small, hot, old star that is still giving off light; located at the bottom of the H_R Diagram |
| spiral | the shape of our galaxy; looks like a pin wheel |
| elliptical | oval shaped galaxy; believed to be the oldest type |
| Big Bang | theory that describes the beginning of the universe |
| William Hubble | famous astronomer that grouped the galaxies |
| astrology | not real science; based on the 12 signs of the zodiac |
| Polaris | all the stars appear to move around this star due to the Earth's rotation |
| irregular | galaxy with no definite shape |
