Chapter 2

Question Answer
Heliocentric Model Sun-centered representation, including a Sun and planets.
Terrestrial Planets Objects in space that resemble Earth.
Big-Bang Theory Hypothesis that describes how the universe began.
Geocentric Model Earth-centered representation, including the Sun and planets.
Solar System The Sun and the planets and other objects that orbit the Sun. Also, any star and the objects that revolve around it.
Satellite A natural or human built object that revolves around another object in space.
Gas Giants Large planets made up mostly of gaseous and liquid substances.
Universe The sum of everything that exists.
Moon Natural object that revolves around a planet.

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