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 gas that lays between stars in galaxies.
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Questions about spacecraft journeying to other stellar systems.
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Questions about the German astronomer famous for his three laws of planetary motion. Do not use this tag for questions about the Kepler spacecraft.
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Questions regarding Jupiter, the 5th and largest planet in Earth's solar system.
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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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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the Andromeda Galaxy. A spiral galaxy and the largest member of the local group of galaxies. M31 is currently about 2.2 million light years from the Milky Way, but is approaching and is expecte…
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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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