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.

Type to find tags:
× 19 × 21
Questions about Mercury, the first planet from Earth'd sun. Also the smallest major planet in the Solar System,
× 4 × 8
× 2
× 33
Questions on objects passing through the atmosphere which leave visible wakes of incandescent material.
× 20
× 71
Questions regarding the Milky Way Galaxy, the galaxy that Earth's solar system is in.
× 5 × 14 × 9
× 6
Questions regarding the possible existence of other universes.
× 16
Questions about observations performed without the aid of any optical instrument.
× 12
Questions regarding the process of assigning an identifying set of characters to an astronomical object.
× 6
Questions regarding the National Aeronautics and Space Administration, the American civilian space agency.
× 31
Questions on celestial bodies that orbit planets.
× 7
Questions regarding the process of accurately finding your location, and getting to another place by planning and following a map.
× 17 × 12
× 21
A collection of ionized gases and dust in interstellar space
× 11
Questions regarding Neptune, the 8th and furthest major planet orbiting Earth's sun.
× 8
Questions regarding a family of extremely low-mass, electrically neutral particles described in the Standard Model of particle physics.
× 38
Questions regarding a degenerate star that is mainly composed of neutrons.
× 19
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…
× 16
Questions about reflecting telescopes using a concave primary mirror and a flat diagonal secondary mirror.
× 2
× 3
× 9
Questions to do with how new atomic nuclei are created inside the universe.
× 3
× 20 × 124
Questions regarding the action or process of observing a single object carefully to glean information.