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:
× 9
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…
× 57
Questions regarding Mars, the fourth planet from the sun.
× 48
Questions regarding the property of astronomical objects that determines their inertial resistance and gravitational interaction with other bodies.
× 21
× 24
Questions about Mercury, the first planet from Earth'd sun. Also the smallest major planet in the Solar System,
× 4 × 8 × 3
× 33
Questions on objects passing through the atmosphere which leave visible wakes of incandescent material.
× 20
× 72
Questions regarding the Milky Way Galaxy, the galaxy that Earth's solar system is in.
× 6 × 14
× 10
× 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.
× 7
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 × 13 × 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.
× 40
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.
× 4
× 3
× 9
Questions to do with how new atomic nuclei are created inside the universe.
× 3