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:
× 51
Questions regarding the property of astronomical objects that determines their inertial resistance and gravitational interaction with other bodies.
× 51
Questions about observation performed in the radio frequency range of the electromagnetic spectrum (between 10 MHz and 1GHz).
× 49
Questions on systems to uniquely determine position of a point or other geometric element on a manifold such as Euclidean space.
× 48
Questions related to the physical processes involved in or to the observations of the process of forming a star.
× 47
Waves in spacetime formed by the acceleration of massive bodies. A passing wave causes spacetime to be stretched and squashed by a very small amount. Typically we can only detect the most energic grav…
× 47
Questions related to the phenomenon whereby electromagnetic radiation (such as visible light) generated by an object moving away from an observer will have increased in wavelength (i.e. shifted toward…
× 44
Questions regarding life in the universe, especially the possibility of life outside our planet, or the influence of astronomical forces on life on Earth.
× 44
Questions regarding a degenerate star that is mainly composed of neutrons.
× 43
a measurement of the average kinetic energy of the molecules in an object or system. In simpler words: it's the degree or intensity of heat present in a substance or object that is comm…
× 41
Questions regarding the phenomenon in the early universe characterized by an extreme expansion of space.
× 41
gravitationally linked and orbit around their barycenter.
× 40
a process of inspecting, cleaning, transforming, and modeling data with the goal of discovering useful information, suggesting conclusions, and supporting decision making.
× 40
Questions regarding the history of astronomy, including discoveries and scientists.
× 40
Questions about the measurement of light waves whereby the wavelength is classified by its position in the electromagnetic spectrum.
× 37
Questions regarding an object's movement, or its distance traveled relative to the time taken.
× 37
Questions regarding the planet Venus, the second planet from Earth's sun.
× 35
Questions regarding the former 9th (now dwarf) planet Pluto.
× 34
Questions about the parameters needed to specify the characteristics of an orbit.
× 34
Questions on objects passing through the atmosphere which leave visible wakes of incandescent material.
× 32
Questions on celestial bodies that orbit planets.
× 32
Questions regarding magnetic fields.
× 32
Questions related to techniques and equipment related to amateur to professional astronomical photography.
× 32
Questions regarding two or more stars gravitationally bound to each other
× 31
Questions regarding the cosmic microwave background, or CMB, the leftover radiation that is taken by many as proof of the Big Bang.
× 31
Questions regarding the as-yet-unknown energy permeating the universe that is responsible for its expansion.
× 31 × 29
Questions about Saturn, the 6th planet in Earth's solar system.
× 29
Questions regarding interactions between galaxies or between major parts of a galaxy.
× 29 × 28
Questions regarding massive planets composed of layers of gases, such as hydrogen and helium, surrounding a solid/liquid core.
× 28
Questions about the dynamical processes leading to the assembling of a celestial object.
× 28
Questions about solar system planets/moons and exoplanets that exhibit similar features to the Earth.
× 27
Questions about the complete or partial blocking of the sun by the moon.
× 27
Questions about the processes, theories and evidence for the formation of planetary bodies.
× 26 × 26
Questions about photography of celestrial objects by amateur astronomers.