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Gravity The force that attracts one object to another or towards the center of the Earth.
Solar System The collection of eight planets and their moons as well as other objects in orbit around the sun.
Asteroids Objects revolving around the sun that are too small and numerous to be considered planets
Asteroid belt The region of the solar system between Mars and Jupiter where asteroids are found
Big Bang The initial explosion that resulted in the formation and expansion of the universe
Comet A ball of ice and dust whose orbit is a long, narrow eclipse
Geocentric Theory A description of the solar system in which all of the planets revolve around the earth
Heliocentric Theory A description of the solar system in which all of the planets revolve around the sun.
Inertia The tendency of a moving object to continue in a straight line or a stationary object to remain in place.
Meteor A streak of light in the sky produced by the burning of a meteoroid in Earth's atmosphere
Meteoroid A chunk of rock or dust in SPACE
Meteorite A meteoroid that has hit Earth's surface
Galileo Early astronomer that used a telescope to study the night sky - discovered moons orbiting Jupiter
Ptolemy Early astronomer that believed that the Earth was at the center of the universe
Copernicus An early astronomer whose theory stated that the SUN is at the center of the universe
Kepler An astronomer that discovered that all of the planets revolve around the sun in elliptical orbits (not circles)
Created by: aylamaster
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