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Chapter 28

Across
A planet's apparent backward movement in the sky
An oval that is centered on two points called foci; the shape of planets' orbits
Low, warm, dark-colored cloud that sinks and flows rapidly in the Jovian atmosphere
Ratio of the distance between the foci to the length of the major axis; defines the shape of a planet's elliptical orbit
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
Form of hydrogen with both liquid and metallic properties that exists as a layer in the Jovian atmosphere
Large, gaseous planet that is very cold at its surface; has ring systems, many moons, and lacks solid surfaces
Cliff on Mercury; similar to those on Earth but much higher
Piece of interplanetary material that falls toward Earth and enters its atmosphere
Down
One of the rocky-surfaced, relatively small, dense inner planets closest to the Sun
High, cool, light-colored cloud that rises and flows rapidly in the Jovian atmosphere
Streak of light produced when a meteoroid falls toward Earth and burns up in Earth's atmosphere
Small, eccentrically orbiting body made of rock and ice which have one or more tails that point away from the Sun
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
Space object built of solid particles that can form planets through collisions and mergers
The average distance between the Sun and Earth, 1.496 x 10^8 km
Occurs when Earth intersects a cometary orbit and comet particles burn up as they enter Earth's upper atmosphere
Small solar system bodies that are mostly rock and ice, lies outside the orbit of Neptune, 30 to 50 AU from the Sun, most probably formed in this region