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Unit1 Solar System
Grade 6
Question | Answer |
---|---|
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. |