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Unit1 Solar System
|a large cloud of gas and dust
|Series of reactions take place in the core of stars
|a large collection of stars, gas, and dust.
|space and all the matter and energy in it
|the distance that light travels through space in one year.
|contain as many as several thousand galaxies
|made up of 10 or more clusters of galaxies
|huge spherical areas where very little matter exists
|a gigantic explosion in which a high-mass star collapses, throwing its outer layers into space. But its core remains.
|an invisible object with gravity so great that nothing, not even light, can escape it
|is a small, incredibly dense ball of closely packed neutrons.
|When hydrogen fusion slows, the core of high mass stars , produce elements heavier than carbon, then it expand to become much larger.
|consists of a star, the sun, and all the objects in orbit around the sun.
|Planets have solid, rocky crusts and dense mantles and cores.
|Planets are gaseous, larger, and less dense than the terrestrial planets.