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a relatively inexpensive Newtonian telescope, in which the tube assembly slips freely in the lower base.
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Questions regarding the brightness of an object.
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Questions about Titan, the largest moon of Saturn.
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Questions regarding the large-scale change of orbits over time, as in the Nice Model.
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Questions about Mercury, the first planet from Earth'd sun. Also the smallest major planet in the Solar System,
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Questions regarding structures designed to aid in the observation of astronomical objects.
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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 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 about volcanic processes and observations.
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Space debris (also known as "orbital debris", "space junk", or "space waste") is the collection of defunct objects in orbit around Earth and includes everything from spent rocket stages, old satellite…
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A measure of the ratio of an object's mass with its volume.
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Questions regarding atmospheric conditions on either Earth or on other planets.
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Questions regarding a theoretical 'tunnel' through spacetime which could potentially allow time travel.
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Questions regarding Charon, the largest satellite of the dwarf planet Pluto. Often considered to be Pluto's binary.
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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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