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Ch 28 Vocab.

TermDefinition
planetesimal space object built of solid particles that can form planets through collisions and mergers
retrograde motion a planet's apparent backward movement in the sky
ellipse an oval shape that is centered on two points instead of a single point as in a circle
astronomical unit the average distance between the sun and earth, 1.496 X 10 8 km.
eccentricity the quality of being eccentric
terrestrial planet the four inner planets
scarp a cliff on Mercury; similar to those on Earth but much higher
gas giant planet are all very large, ranging from 15 to more than 300 times the mass of Earth, and from about 4 more than 10 times Earth's diameter
liquid metallic hydrogen a form of hydrogen that has properties of both a liquid and a metal, which can exist only under conditions of very high pressure
belt low, warm, dark-colored clouds that rise
zone are high, cool, light-colored clouds that rise
Created by: selenamercado
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