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alien a living being from another planet; extraterrestrial. There is no evidence that aliens exist, but many people believe there is life on other planets. [2/5 definitions]
asteroid a small, rocky, planet-like body that circles the sun, mostly found between the orbits of Jupiter and Mars. The size of an asteroid can range from less than one mile to five hundred miles across.
crust the outer layer of Earth, another planet, or a moon. [1/5 definitions]
earth (often capitalized) the fifth largest planet in our solar system and the third in distance from the sun. [2/4 definitions]
eclipse the blocking from view of the sun, a moon, or a planet by another heavenly body. In an eclipse of the sun, the sun is hidden from earth's view by the moon passing between the sun and the earth. [1/3 definitions]
extraterrestrial existing or coming from a place outside planet Earth.
galaxy a collection of billions of stars and other matter held together by gravity. Our planet Earth and the sun belong to the Milky Way galaxy. They are only tiny parts of this galaxy.
geology the parts of a particular place or planet that have to do with geology. [1/2 definitions]
globe the world; planet Earth. [1/2 definitions]
Jupiter the largest planet in the solar system and fifth in distance from the sun. Jupiter has sixteen moons and is more than one thousand times larger than Earth. [1/2 definitions]
Mars the seventh largest planet in the solar system and fourth in distance from the sun. Mars is known as "the red planet" because of its unusual color. [1/2 definitions]
mercury (capitalized) the planet of the solar system that is nearest to the sun. Mercury is the second smallest planet. [1/3 definitions]
Neptune the fourth largest planet in the solar system and eighth in distance from the sun. [1/2 definitions]
orbit the curved path in which a planet, satellite, or spacecraft moves in a circle around another body. [1/3 definitions]
Pluto a dwarf planet in the Earth's solar system, formerly considered a planet and the one that was smallest and farthest from the sun. [1/2 definitions]
satellite a heavenly body that moves around a planet or another larger body. [2/3 definitions]
Saturn the second largest planet in the solar system and sixth in distance from the sun. Saturn is known for the icy rings that circle its middle. [1/2 definitions]
terrestrial of or relating to the planet Earth. [1/2 definitions]
Uranus the third largest planet in the solar system and seventh in distance from the sun. [1/2 definitions]
Venus the sixth largest planet in the solar system and second in distance from the sun. Venus has a dense, cloudy atmosphere. The clouds that cover Venus reflect light and make it the brightest planet. [1/2 definitions]
world a planet or star thought of as being like the earth. [1/6 definitions]