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The Solar System MS-ESS1-3

NGSS

asteroid

a body of rock and metal that orbits the Sun
asteroid Simple Definition

astronomical unit

the average distance between Earth and the Sun, about 150 million km, or 93 million miles
astronomical unit Simple Definition

comet

a body of ice, rock, and dust that orbits the Sun
comet Simple Definition

gas giant

a large planet made up mostly of gases, like Jupiter or Saturn
gas giant Simple Definition

light year

the distance light travels in a year: 9.5 trillion km
light year Simple Definition

moon

a natural body that revolves around a planet
moon Simple Definition

scale

A ratio of the size of a model to the object it represents.
scale Simple Definition

terrestrial planet

one of the four rocky planets of the inner solar system, Mercury, Venus, Earth or Mars
terrestrial planet Simple Definition

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