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6th Unit 1-c

Solar System Key Terms

TermDefinition
asteroid an irregularly shaped rock that orbits the Sun.
comet a space object made of ice and dust that orbits a star and develops a long, bright tail as it nears its star.
core the center of an object.
crater a hole in the ground caused by the impact of an object from space.
dwarf planet a nearly round object that orbits a star, is smaller than a planet, and is not a satellite of another object.
gas giant a large planet that is mainly made up of gases.
gravity the force that pulls all objects toward each other.
moon a huge ball of rock that travels around a planet; a natural satellite.
orbit to revolve around another object.
planet a very large object that orbits a star.
satellite a natural or human-made object that orbits Earth or another object in space.
solar system a group of objects in space that orbit a star
star a body in outer space, made of hot gases, that shines in the night sky.
terrestrial like Earth; describes planets that are rocky and Earthlike in size.
asteroid belt the area in space between Mars and Jupiter where most asteroids orbit.
atmosphere a layer of gases surrounding a planet, star, or moon.
gas a substance with no fixed volume or shape that can expand freely.
helium the second lightest chemical element; often a gas.
hydrogen the lightest chemical element; often a gas.
mass the measure of the amount of matter in an object.
methane a colorless, odorless, flammable gas commonly called "natural gas".
oxygen a gas that has no color, taste, or smell, and which people need to live.
Created by: darrin_evans
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