| definition |
 |
|
| Vocabulary word |
|
|
| the distance that light travels in a year |
light year |
| study of the universe |
astronomy |
| when the moon blocks the sun's light over a part of earth |
solar eclipse |
| the brightness of a star as viewed from Earth |
apparent magnitude |
| third rock from the sun |
Earth |
| a large body that revolves around a star |
planet |
| a pattern of stars in the sky |
constellation |
| a hot rotating ball of hydrogen and helium gases that creates its own light through nuclear fusion reactions |
star |
| billions of stars held together by gravity |
galaxy |
| huge clouds of gas and dust where the stars and planets are born |
nebulas |
| a small object made up of ice, frozen gas and dust (dirty snowball) that orbits the sun |
comet |
| the measure of a star's true brightness |
absolute magnitude |
| source of huge amounts of energy in form of radio waves |
quasar |
| the band of constellations through which the sun appears to pass through the year |
zodiac |
| when the earth's shadow falls across the moon |
lunar eclipse |
| family of planets and moons that revolves around a star |
solar system |
| a tiny bit of metal and rock from a comet that travels through space |
meteoroid |
| a natural satellite of a planet |
moon |
| the force that attracts objects to each other |
gravity |
| an area of cooler temperatures on the sun where magnetic activity occurs |
sunspot |
Ch.18 LTI-MA 509
