A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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a planet that has a compact rocky surface like the Earth's; the four innermost planets in the solar system.
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Questions about Titan, the largest moon of Saturn.
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a relatively inexpensive Newtonian telescope, in which the tube assembly slips freely in the lower base.
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A measure of the ratio of an object's mass with its volume.
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The corresponding particles of opposite charge to the particles of conventional matter (e.g. the positron is the antiparticle of the electron)
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Questions about the "adulthood" of stars. The main sequence is a distinctive band of stars that appears in a color-magnitude plot (known as Hertzsprung-Russell diagram). Stars appear in the main seque…
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Questions regarding structures designed to aid in the observation of astronomical objects.
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Questions about the apparent displacement of a celestial body with respect to its background when observed along two different lines of sight.
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Questions regarding atmospheric conditions on either Earth or on other planets.
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Questions about volcanic processes and observations.
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Questions regarding the process of accurately finding your location, and getting to another place by planning and following a map.
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Questions regarding the National Aeronautics and Space Administration, the American civilian space agency.
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any minor planet in the Solar System that orbits the Sun at a greater average distance (semi-major axis) than Neptune.
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Inclination defines the angle between the plane of the orbit of a planet or comet and another plane, usually that of the ecliptic.
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