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.
Questions relating to the discovery of a new ninth planet (not Pluto) hypothesized in the Solar System.
Questions regarding disks of gas, dust, and plasma around a central object, such as a black hole, which takes in the matter.
Questions about the observation of celestial objects by non-professional astronomers.
The corresponding particles of opposite charge to the particles of conventional matter (e.g. the positron is the antiparticle of the electron)
Questions regarding how bright an object appears to be.
Questions about man-made objects orbiting astronomical objects.
Questions about the large ring of rocky bodies between Mars and Jupiter.
Questions regarding relatively small rocky bodies in an orbit around the Sun.
Questions about oscillations, or quakes in stars, where energy is transmitted as seismic waves.
Questions about the origins of life on Earth, and the existence and detection of extraterrestrial life.
Questions about the chemical reactions that occur in the interstellar medium.
Questions about the measuring the position of stars, and the techniques used to do this.
Questions involving the physics of the universe, especially the nature of astronomical objects, energy fields, and/or regions, rather than their positions or motions in space.