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C h 27- planets

QuestionAnswer
solar system the sun and all of the other bodies that orbit around it
planet any of the primary bodies that orbit a star
solar nebula a rotating cloud of gas and dust from which the sun and planets formed
planetesimal a small body from which a planet orginated
differentiation process during planet formation when denser materials sink to the center
outgassing process of volcanic eruptions releasing water vapor and other gases
ozone a molecule with three atoms of oxygen which shield us from ultraviolet radiation
geocentric model of the solar system, proposed by Aristotle and Ptolemy, where the Earth is at the center
heliocentric model of the solar system, proposed by Copernicus, where the Sun is at the center
retrograde motion the apparent backward motion of closer objects compared to background objects
eccentricity the degree of elongation of an elliptical orbit
ellipse a closed curve with two focal points, where the distance from one focus to the curve to the other focus remains constant
law of ellipses each planet orbits the sun in an elliptical path
law of equal areas a planet sweeps out equal areas in equal amounts of time in its orbit
law of periods the cube of a planets average distance from the sun is proportional to the square of its orbital period
orbital period time required for a body to complete an orbit
inertia the tendency of an object at rest to remain at rest, or if moving to resist a change in speed or direction
terrestrial planets one of the dense planets nearest to the sun: "earthlike"; Mercury, Venus, Earth, and Mars
greenhouse effect the trapping of energy in the atmosphere by water vapor and carbon dioxide
gas giant a planet that has a massive atmosphere; "Jovian" or Jupiter-like; Jupiter, Saturn, Uranus, and Neptune
Kupier belt region of the solar system just beyond the orbit of Neptune
Created by: sisteele
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