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Chapter 28

TermDefinition
planetesimal objects hundreds of kilometers in diameter
retrograde motion the apparent backward movement of a planet
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
eccentricity the ratio of the distance between the foci to the length of the major axis
terrestrial planet the four inner planets
scarp Mercury's planetwide system of cliffs
gas giant planet large, gaseous planet that is very cold at its surface
liquid metallic hydrogen a form of hydrogen that has properties of both a liquid and a metal and can only exist under conditions of very high pressure
belt low, warm, dark-colored clouds that sink
zone high, cool, light-colored clouds that rise
dwarf planet an object that, due to its own gravity, is spherical in shape, orbits the sun, is not a satellite, and has not cleared the area of its orbit of smaller debris
meteoriod an asteriod fragment, or any other interplanetary material that enters Earth's atmosphere
meteor a metereoroid that passes through the atmosphere, and heated by friction and burns, producing a streak of light
meterorite a meteoroid that does not brurn up completely and part of it strikes the ground (it is the part that hits the ground)
Kuiper belt samll solar system bodies that are mostly rock and ice, lies outside the orbit of Neptune
comet small, icy bodies that have highly eccentric orbits around the Sun
meteor shower bright streaks of light caused from when Earth crosses the trail of a comet and particles left in the trail burn in Earth's upper atmosphere
Created by: spjaco
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