| albedo- The ratio of the amount of solar radiation reflected from an object to the total amount incident upon it |
| asteroid- One of many small rocky bodies orbiting the Sun; a concentration of these makes up the asteroid Belt between Mars and Jupiter |
| basalt-Fine-grained igneous rock(rick in mafic minerals) that has erupted onto the surface |
| crater- An approximately circular depression, sometimes surrounded by a raised rim. craters are typically formed by explosion during meteorite impact |
| density-the average number of individuals or units per space unit |
| diameter-the length of a straight line through the center of an object |
| eccentricity- deviation from circular |
| inclination- a tilting of something; act or the action of bending |
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| Jupiter- planet fifth in order from the sun. In Roman mythology, ruler of the gods(Greek name, Zeus) |
| Mars- planet fourth in order from the sun. In Roman mythology, god of war and discord(Greek name, Ares) |
| mass- expanse or bulk |
| mean-being near the average; occupying a middle position |
| mercury- the planet closest to the sun. In Roman mythology, the fleet-footed messenger god and escort of dead souls to the underworld(Greek name, Hermes) |
| Neptune-planet eight in order from the sun. In Roman mythology, god of the sea(Greek name,Poseidon) |
| obliquity-tilt of axis in degrees |
| orbit- to travel in circles;revolve; revolution |
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| Pluto-planet ninth in order, and farthest, from the sun. In Greek mythology, god of the dead and the underworld |
| revolution-the action by a celestial body of going round in an orbit or elliptic course;circle(see orbit) |
| rotation- the action or process of rotating on or as if on an axis or center; one complete turn |
| satellite- a celestial body orbiting another of larger size |
| Saturn-planet sixth in order from the sun. In Roman mythology, god of agriculture, and father of Jupiter(Greek name, Cronos) |
| Uranus-planet seventh in order from the sun. In Roman mythology, god of the sky, mate of the goddess of the Earth, and father of the Titans |
| Venus-planet second in order from the sun. In Roman mythology, goddess of love(Greek name, Aphrodite) |
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