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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 "Goldilocks Zone" around a parent star where conditions are just right for the potential of life developing.
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Questions about the water molecule (composed of two atoms of hydrodgen and one atom of oxygen) and its detection in celestial objects.
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A measure of the ratio of an object's mass with its volume.
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Questions about reflecting telescopes using a concave primary mirror and a flat diagonal secondary mirror.
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Questions about observations performed without the aid of any optical instrument.
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Questions about quasi-stellar radio sources, active galactic nuclei that are far away and quite old.
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Questions regarding casually watching the stars.
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Questions regarding two objects colliding into each other with considerable force.
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Questions about planets that do not orbit around a star. These planets travel through space.
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Questions about streams of plasma released from the Sun or other stars (stellar winds).
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Questions regarding structures designed to aid in the observation of astronomical objects.
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like stars but never achieve nuclear fusion because they are too low-mass.
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Questions regarding the inner portion of a galaxy; in the Milky Way, this is the area around Sagittarius A*.
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Questions regarding disks of gas, dust, and plasma around a central object, such as a black hole, which takes in the matter.
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Questions regarding the large "cloud" of small bodies that forms a sphere around the solar system.
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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 theory of gravity as proposed by Newton, in which the force of gravity depends only on the mass of bodies, a constant, and the distance between them, and depends on one equatio…
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Questions regarding the large-scale change of orbits over time, as in the Nice Model.
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Questions regarding Neptune, the 8th and furthest major planet orbiting Earth's sun.
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For questions about objects or phenomena outside Earth, generally on other planets.
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Questions about the branch of astronomy that studies the regularities in the motions of stars in gravitational fields of stellar systems, as well as the evolution of stellar systems.
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Questions regarding bodies smaller than planets but larger than other bodies, that do not meet at least one of the IAU's criteria for being a planet.
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Questions about the outermost layer of a body.
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Questions relating to the discovery of a new ninth planet (not Pluto) hypothesized in the Solar System.