Solar System Vocabulary Flashcards

Terms Definitions
Geocentric
A model of the universe in which Earth is at the center of the revolving planets and stars.p#555
Heliocentric
A model of the solar system in which the Earth and the other planets revolve around the sun.p#556
Ellipse
An oval shape, which may be elongated or nearly circular.p#557
Inertia
The tendency of an object to resist a change in motion.p#522
Gravity
A force that moves rocks and other materials downhill; the force that pulls objects toward each other.p#205,520
Terrestrial Planets
The name often given to the four inner planets: Mercury, Venus, Earth, and Mars.p#566
Retrogade Rotation
Greenhouse Effect
The process by which heat is trapped in the atmosphere by water , vapor, carbon dioxide , methane, and other gases that form a "blanket" around Earth; the trapping of heat by a planets atmosphere.p#411,569
Gas Giant
The name often given to the four outer planets: Jupiter, Saturn, Uranus, and Neptune.p#575
Comet
A loose collection of ice, dust and small rocky particles, typically with a long, narrow orbit of the sun.p#585
Asteroid
Rocky objects revolving around the sunhat are too small and numerous to be considered palnets.p#586
Asteroid Belt
The region of the solar system between the orbits of Mars and Jupiter, where many asteroids are found.p#586
Meteoroid
A chunk of rock or dust in space.p#533,587
Meteor
A streak of light in the sky produced by the burning of the meteoroid in Earths atmosphere.p#587
Meteorite
A meteoroid that passes through the atmosphere and hits Earths surface.p#587
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