| Question | Answer |
|---|---|
| absolute magnitude | true brightness of a star |
| apparent magnitude | how bright a star appears to us |
| asteroid | irregularly shaped pieces of rock, metal, and dust and are sometimes called minor planets |
| astronomy | scientific study of celestial (of or in the universe) objects |
| binary system | a star group containing two stars that revolve around each other |
| black hole | a super-giant that collapses and disappears from space |
| circumpolar constellation | circles around the pole daily |
| comet | An icy chunk of frozen gases, water, and dust that continually orbits the Sun |
| constellation | groups of stars that appear to form pictures and make stars easier to find |
| galaxy | huge star system that contains millions, or even billions of stars and covers many light-years of space |
| light-year | the distance that light travels in one year |
| magnitude | the brightness of a star |
| meteorite | a meteor that does not burn up in Earth atmosphere and impacts Earth’s surface |
| meteoroid | a chunk of metal or stone that is moving toward Earth’s atmosphere |
| meteor | a meteoroid that lights up because of friction as it moves through Earth’s atmosphere |
| multiple star group | a small star group of three or four stars |
| nebula | interstellular gasses and debris |
| neutron star | neutrons tightly packed to form small star |
| parallax | the apparent movement or change in position of one star in relationship to other stars |
| pulsar | a neutron star that spins rapidly on its axis |
| variable star | star swells and shrinks, brightens and dims |
| red-shift | the color given by objects moving away from the Earth |
| star cluster | A large group of stars close enough to be held together by gravity |
