14 terms

Pearson Science Grade 5 Chapter 9 Vocabulary

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revolution
one full orbit around the sun
axis
an imaginary line around which an object spins
solar flare
an explosive eruption of waves and particles into space
rotation
one whole spin of an object on its axis
constellation
a group of stars that forms a pattern
orbit
the path an object takes as it revolves around a star, planet, or moon
comet
a frozen mass of different types of ice and dust orbiting the sun
moon
a natural object that revolves around a planet
planet
a large, round object that revolves around a star and has cleared the region around its orbit
dwarf planet
a large, round object that revolves around the sun but has not cleared the region around its orbit
outer planet
any of the four planets in our solar system beyond Mars -- Jupiter, Saturn, Uranus, Neptune
inner planet
any of the four closest planets to the sun -- Mercury, Venus, Earth, Mars
asteroid
a rocky mass up to several hundred kilometers wide that revolves around the sun
space probe
a spacecraft that gathers data without a crew
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