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:
× 8
Questions regarding Uranus, the 7th planet from Earth's sun.
× 8
Questions regarding a family of extremely low-mass, electrically neutral particles described in the Standard Model of particle physics.
× 8 × 8
× 8 × 8 × 8 × 8
Questions about the apparent displacement of a celestial body with respect to its background when observed along two different lines of sight.
× 8
× 7
Questions about large, dense, massive collections of stars orbiting galaxies, thought to have formed in the early universe.
× 7
Questions regarding matter at densities so high that gravitational contraction is countered by the Pauli exclusion principle.
× 7
a relatively inexpensive Newtonian telescope, in which the tube assembly slips freely in the lower base.
× 7 × 7
Questions about the dwarf planet, and the largest asteroid n the Solar System, comprising 1/3 of the mass of the asteroid belt. Ceres orbits between Mars and Jupiter.
× 7
× 7
Questions regarding the non-stellar objects gravitationally bound to a star or star system.
× 7 × 7 × 7
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…
× 7
Questions about the German astronomer famous for his three laws of planetary motion. Do not use this tag for questions about the Kepler spacecraft.
× 7 × 7
Questions regarding the National Aeronautics and Space Administration, the American civilian space agency.
× 7
Questions regarding the process of accurately finding your location, and getting to another place by planning and following a map.
× 7
× 7
Questions regarding atmospheric conditions on either Earth or on other planets.
× 7
any minor planet in the Solar System that orbits the Sun at a greater average distance (semi-major axis) than Neptune.
× 6
Questions regarding a theoretical 'tunnel' through spacetime which could potentially allow time travel.
× 6
Space debris (also known as "orbital debris", "space junk", or "space waste") is the collection of defunct objects in orbit around Earth and includes everything from spent rocket stages, old satellite…
× 6 × 6 × 6
Questions regarding the possible existence of other universes.
× 6
× 6
Questions about the chances of collisions between two objects or groups of objects, based on factors such as velocity, mass and number density.
× 6 × 6 × 6