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 about the NASA space observatory famous for finding potentially habitable exoplanets. Do not use this tag for questions about Johannes Kepler.
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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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Questions on any of the 5 locations where a small object can maintain a stable orbital configuration with respect to two co-orbiting larger bodies.
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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 life in the universe, especially the possibility of life outside our planet, or the influence of astronomical forces on life on Earth.
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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.
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the group of galaxies that includes the Milky Way among others.
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Questions regarding the brightness of an object.
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Questions regarding an event where the Earth goes between the Sun and the Moon and casts a shadow on the Moon.
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Questions regarding magnetic fields.
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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 regarding the property of astronomical objects that determines their inertial resistance and gravitational interaction with other bodies.
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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 on objects passing through the atmosphere which leave visible wakes of incandescent material.
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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 about observations performed without the aid of any optical instrument.
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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 National Aeronautics and Space Administration, the American civilian space agency.
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Questions on celestial bodies that orbit planets.
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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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