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Our Solar System



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2 Large, gaseous planet that is very cold at its surface; has ring systems, many moons, and lacks solid surfaces—Jupiter, Saturn, Uranus, and Neptune
4 Region of the space that lies outside the orbit of Neptune, 30 to 50 AU from the Sun, where small solar system bodies that are mostly rock and ice probably formed
5 Occurs when Earth intersects a cometary orbit and comet particles burn up as they enter Earth's upper atmosphere
7 A small fragment of an orbiting body that has fallen to Earth, generating heat; does not completely burn up in Earth's atmosphere and strikes Earth's surface, sometimes causing an impact crater
9 One of the rocky-surfaced, relatively small, dense inner planets closest to the Sun—Mercury, Venus, Earth, and Mars
10 Space object built of solid particles that can form planets through collisions and mergers
11 Ratio of the distance between the foci to the length of the major axis; defines the shape of a planet's elliptical orbit
15 The average distance between the Sun and Earth, 1.496 × 108 km
17 A planet's apparent backward movement in the sky
1 Form of hydrogen with both liquid and metallic properties that exists as a layer in the Jovian atmosphere
3 Streak of light produced when a meteoroid falls toward Earth and burns up in Earth's atmosphere
6 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
8 Piece of interplanetary material that falls toward Earth and enters its atmosphere
12 Cliff on Mercury; similar to those on Earth but much higher
13 High, cool, light-colored cloud that rises and flows rapidly in the Jovian atmosphere
14 Low, warm, dark-colored cloud that sinks and flows rapidly in the Jovian atmosphere
16 Small, eccentrically orbiting body made of rock and ice which have one or more tails that point away from the Sun
18 An oval that is centered on two points called foci; the shape of planets' orbits
 
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