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5th Grade Space

Earth and Space Science Vocabulary - CA #12

TermDefinition
Solar System Made up of a star and the planets and other space objects that revolve around it.
Elliptical Oval shaped. "The orbits of the planets in our solar system are not perfect circles, they are elliptical."
Planet A large round body that revolves around a single star in it's own orbit. *All of these space objects in our galaxy orbit the sun.
Comet A chunk of frozen gases, rock, ice and dust orbiting the sun. *This space object's TAIL points away from the sun.
Asteroid A chunk of rock or iron less than 1,000 k (621 mi) in diameter that orbits the sun. *This space object does NOT have a tail.
Dwarf Planet A nearly round body, slightly smaller than a planet, whose orbit crosses another body. *This space object does NOT have it's own orbit. (Example: Pluto)
Galaxy Made up of dust, gases and many stars. Held together by gravity.
Sun A star.
Milky Way The galaxy earth in which earth is found.
Diameter A type of measurement for spheres, This form of measurement distinguishes how large or small a circle or round object is.
Moons Orbit other planets. *NOT considered planets because they do not orbit, or revolve, around stars (or the sun).
Jovian Planets Another name for "outer planets" or "gas giants"
Mercury Smallest planet in our solar system. *inner planet
Jupiter Largest planet in our solar system. *outer planet
Revolution When an object circles an external axis (like the Earth circles, or orbits, the sun)
Rotation When an object turns around an internal axis (like the Earth turns around its axis)
Axis An imaginary line about which a body, or planet, rotates. *Earth completes a rotation it's ___ every 24 hours.
Created by: Aerialelia
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