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Ch. 7 Solar System

Planets -Solar System McGraw

TermDefinition
asteroid a small, rocky object that orbits the Sun
comet made of gas, dust, and ice that orbits the sun
AU the average distance from earth to the sun 150 million km
period of revolution time it takes an object to travel once around the Sun
period of rotation The time it takes an object to complete one rotation, or spin on its axis
geocentric model Earth is center of Solar System
heliocentric model Sun is center of Solar System
terrestrial planet A planet with a rocky surface like Earth, Venus, Mercury, and Mars.
greenhouse effect warming that results when solar radiation is trapped by the atmosphere
meteoroid a relatively small, rocky body that travels through space
meteor A streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere.
meteorite A meteoroid that has hit earth's surface.
dwarf planet An object that orbits the sun and is spherical, but has not cleared the area of its orbit.
impact crater a round pit on a planet, moon or asteroid formed by an object colliding into it
dwarf planet Ceres found in the asteroid belt
Pluto found in the Kuiper belt
Eris largest dwarf planet
Oort cloud a spherical region that surrounds the solar system, that extends from the Kuiper Belt to almost halfway to the nearest star, and contains billions of comets
Created by: user-1988879
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