apparent magnitude - a measure of how bright a star appears as seen from Earth, absolute magnitude - a measure of how bright a star really is, if all stars were the same distance from Earth, star - luminous globe of gas which produces its own heat and light by nuclear reaction, universe - all of space and its contents, planet - a large body that is orbiting the sun or another star; cannot be a star itself, moon - a natural satellite that orbits a planet or asteroid, asteroid - a small rocky object that orbits the sun; much smaller than a planet, meteor - a shooting star; a small object from space that has entered earth’s atmosphere, comet - a small frozen ball of gas, dust, and rock that orbits the sun, nebulae - clouds of dust and gas; site of star formation; remains of dead or dying stars, galaxy - a system of stars and associated matter, held together by gravitational attraction,

Components of the Universe

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