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Science test

Astronmy

TermDefinition
axis the imaginary line around which a planet or moon rotates
rotation spinning of earth on its axis
orbit curved path followed by a satellite as it revolves around an object
revolution movement of earth around the sun
lunar highlands mountainous areas on the moon
maria smooth, dark regions on the moon
eclipse event that occurs when the moon moves between the sun and earth, or when earth moves between the sun and moon
tides the rise and fall of sea level caused by the gravitational attraction between the moon and sun
system a portion of the universe and all of its components
solar system system of eight planets and numerous other objects that orbit our sun
astronomical unit unit of measure that equals 150 million km
comet large body of ice and rock that orbits the sun
meteorite any rock from space that survives its plunge through the atmosphere and lands on earth's surface
star a large spherical mass of gas that gives off light and other types of radiation
constellation group of stars that form a pattern in the sky
supernova very bright explosion of the outer part of a supergiant
galaxy group of stars, gas, and dust held together by gravity
light-year about 9.5 trillion km, the distance light travels in one year
Created by: 9oscar9
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