Science Explosion v4, chapter 10

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

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