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11 terms

Universe Vocabulary Set 1

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Gravity
(physics) the force of attraction between all masses in the universe.
Geocentric Model
the early, incorrect model of our solar system with the earth in the center.
Heliocentric Model
the accepted model of our solar system with the sun in the center.
Universe
everything that exists anywhere.
Galaxy
(astronomy) a collection of star systems.
Milky Way Galaxy
the name of our galaxy, a spiral galaxy that contains about 400 billion stars.
Star
any celestial body visible (as a point of light) from the Earth at night.
Planet
any of the celestial bodies (other than comets or satellites) that revolve around the sun in the solar system.
Solar System
the sun with the celestial bodies that revolve around it in its gravitational field.
Light-Year
the distance light travels in one year.
Astronomical Unit
a unit of length used for distances within the solar system.