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albedo the degree to which a planet, asteroid, or the like reflects light. [1/2 definitions]
alien a living being from another planet or other place in the universe; extraterrestrial. [2/6 definitions]
Amalthaea one of the smallest of the planet Jupiter's moons. [1/2 definitions]
aphelion the point that is farthest from the sun in the orbit of a planet or comet.
Ariel one of the five moons of the planet Uranus. [1/2 definitions]
bipolar having two poles, as a planet. [1/2 definitions]
Callisto the second largest of the moons of the planet Jupiter. [1/2 definitions]
celestial body a natural object found outside earth's atmosphere, such as a planet, moon, star, or asteroid.
Charon the only known satellite of the planet Pluto. [1/2 definitions]
conjunction in astronomy and astrology, the lining up of two or more celestial bodies, esp. the sun and a planet, along a line as viewed from Earth. [1/4 definitions]
crust the outer portion of the earth or other planet, or of a moon. [1/7 definitions]
Deimos the smaller of the two moons of the planet Mars.
Dione one of several moons of the planet Saturn.
earth (often cap.) the fifth largest planet in the solar system, which is third in order from the sun and has a diameter of about 7,930 miles. [2/4 definitions]
earth mother (sometimes caps.) the planet earth conceived of as the source of all life. [1/2 definitions]
Enceladus one of several moons of the planet Saturn, having more reflective brightness than any other body in the solar system.
equator any similar circle around a planet or other sphere. [1/2 definitions]
escape velocity the minimum speed by which an object can become free from the field of gravity of a planet, star, or the like.
Europa one of the largest moons of the planet Jupiter. [1/2 definitions]
evening star a bright planet, esp. Venus, seen in the western sky at or soon after sunset.
exoplanet a planet that orbits a star that is not our sun.