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 regarding gravitationally bound systems of hundreds to thousands of galaxies as well as interactions between such systems.
Questions regarding the amount of energy produced by an object per unit of time.
Questions about solar system planets/moons and exoplanets that exhibit similar features to the Earth.
Questions regarding interactions between galaxies or between major parts of a galaxy.
Questions regarding specific terms, names, or naming conventions.
Questions about the apparent force stretching a body towards and away from the center of mass of another body due to the variance in acceleration due to gravity
Questions regarding the cosmic microwave background, or CMB, the leftover radiation that is taken by many as proof of the Big Bang.
Questions regarding telescopes in orbit around Earth, such as the Hubble Space Telescope.
Questions regarding an event where the Earth goes between the Sun and the Moon and casts a shadow on the Moon.
Questions about rings of debris that encircle the equatorial regions of some planets.
For questions about the various phases on the Moon as observed from the Earth, also known as waxing and waning.
Questions about the gas that lays between stars in galaxies.
Questions about man-made objects orbiting astronomical objects.
Questions about computer programs that assist modeling and observing the dynamics of astronomy.
Questions regarding the movement of an object at a given speed and direction, often related to the concepts of orbital velocity and escape velocity.
Questions regarding the bending of light by mass or energy.
Questions about the dynamical processes leading to the assembling of a celestial object.
Questions regarding Albert Einstein's theory that posits, among other things, the equivalence of mass and energy.
Questions about the NASA space observatory famous for finding potentially habitable exoplanets. Do not use this tag for questions about Johannes Kepler.
Questions about using the python programming language to solve astronomical problems.
Questions about Mercury, the first planet from Earth's sun. Also the smallest major planet in the Solar System.
particulate matter that can be found between stars and can be contrasted with molecular or atomic gas, and with ionised plasma. For planetary dust storms, use [du…
For questions about transits of planets in front of the Sun, as seen from another, more distant planet; for example, the transits of Mercury and Venus which are visible from the Earth.