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Unit1 Solar System

Grade 6

Nebula a large cloud of gas and dust
Nuclear fusion Series of reactions take place in the core of stars
Galaxy a large collection of stars, gas, and dust.
Universe space and all the matter and energy in it
Light year the distance that light travels through space in one year.
Clusters contain as many as several thousand galaxies
Superclusters made up of 10 or more clusters of galaxies
Voids huge spherical areas where very little matter exists
Supernova a gigantic explosion in which a high-mass star collapses, throwing its outer layers into space. But its core remains.
Black hole an invisible object with gravity so great that nothing, not even light, can escape it
Neutron is a small, incredibly dense ball of closely packed neutrons.
Supergiant When hydrogen fusion slows, the core of high mass stars , produce elements heavier than carbon, then it expand to become much larger.
solar system consists of a star, the sun, and all the objects in orbit around the sun.
Terrestrial Planets have solid, rocky crusts and dense mantles and cores.
Gas giant Planets are gaseous, larger, and less dense than the terrestrial planets.
Created by: ljouda
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