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Science Chapter 2 Unit B Definitions
Definitions
8
Science
5th Grade
10/20/2012

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Term
terrestrial planets
Definition
An object in space that resembles Earth in size, density, and in its mainly rocky composition.
Term
Big Bang Theory
Definition
A hypothesis, supported by data, that describes how the universe began with a huge explosion.
Term
solar system
Definition
The sun and the planets and other objects that orbit the sun.
Term
gas giants
Definition
A large planet that is made up mostly of gaseous substances, with little or no solid surface.
Term
geocentric model
Definition
A representation of the universe in which stars and planets revolve around Earth.
Term
moon
Definition
A natural object that revolves around a planet.
Term
satellite
Definition
A natural or human-built object that revolves around another object in space.
Term
heliocentric model
Definition
A representation of the relationship between the sun and planets in which the planets revolve around the sun.
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