| 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 |
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