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Science Explosion 11

BJU 6th Science - Chapter 10

magnitude the brightness of a star
apparent magnitude how bright a star appears to us
absolute magnitude true brightness of a star
dwarf small and medium-sized stars
giant star stars that are tens to hundreds of times larger than the Sun
super-giant the largest and brightest stars
light-year the distance that light travels in one year
parallax the apparent movement or change in position of one star in relationship to other stars
variable star star brightness changes
pulsating variable star star swells and shrinks
eclipsing variable star change in appearance of brightness as they orbit each other
nova star that suddenly flares up temporarily becoming brighter
nebula intercellular gasses and debris
supernova death explosion of a star
neutron star neutrons tightly packed to form small star
pulsar a neutron star that spins rapidly on its axis
black hole a super-giant that collapses and disappears from space
constellation groups of stars that appear to form pictures and make stars easier to find
circumpolar constellation circles around the pole daily
astrology the belief that the stars control man’s destiny
astronomy scientific study of celestial (of or in the universe) objects
refracting telescope a telescope that uses only lenses to make objects appear larger
reflecting telescope a telescope that uses lenses and mirrors to make objects appear larger
radio telescope collects radio waves from space using a large concave-shaped disk
spectroscope a device that breaks down light into all its colors; similar to a prism
red-shift the color given by objects moving away from the Earth
binary system a star group containing two stars that revolve around each other
multiple star group a small star group of three or four stars
open star cluster a group of several hundred to a few thousand stars with no particular arrangement
globular cluster a group of several thousand to a million stars that are close to each other and arranged in the shape of a ball
galaxy huge star system that contains millions, or even billions of stars and covers many light-years of space
Local Group our Milky Way in a group of more than 30 other galaxies that travel though space together
asteroid irregularly shaped pieces of rock, metal, and dust and are sometimes called minor planets
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
meteorite a meteor that does not burn up in Earth atmosphere and impacts Earth’s surface
comet An icy chunk of frozen gases, water, and dust that continually orbits the Sun
Created by: MrsDunham
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