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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Questions related to Kuiper Belt Objects that exist in an annulus from 30AU to approximately 50AU from the Earth's Sun.
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a disk-shaped belt of icy debris orbiting in the outer solar system, lying beyond the orbit of Neptune and extending to a distance of about 50 astronomical units, containing thousan…
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Late Heavy Bombardment; occurring between 3.7-4 billion years ago when the inner solar system underwent heavy asteroidal impacts. Also know as the Lunar Cataclysm.
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Questions regarding electromagnetic radiation in the visible spectrum.
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Questions regarding undesired brightening of the night sky inhibiting observation of astronomical objects.
the group of galaxies that includes the Milky Way among others.
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Questions regarding Electro-Magnetic fields, which are generated by charged sub-atomic particles (ions).
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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 Mars, the fourth planet from the sun.
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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 the Milky Way Galaxy, the galaxy that Earth's solar system is in.
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Questions regarding Luna, Earth's moon and only natural satellite.
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Questions regarding the process of assigning an identifying set of characters to an astronomical object.
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Questions regarding the process of accurately finding your location, and getting to another place by planning and following a map.