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 about patterns formed by group of prominent stars in the night sky.
Questions regarding the cosmic microwave background, or CMB, the leftover radiation that is taken by many as proof of the Big Bang.
Questions regarding gravitationally bound systems of hundreds to thousands of galaxies as well as interactions between such systems.
Questions regarding interactions between galaxies or between major parts of a galaxy.
Questions regarding an object orbiting around another object due to the force of gravity.
Questions regarding telescopes in orbit around Earth, such as the Hubble Space Telescope.
Questions about solar system planets/moons and exoplanets that exhibit similar features to the Earth.
Questions about inducing chemistry, physics, and many more branches of science into astronomy.
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 about man-made objects orbiting astronomical objects.
Questions regarding an event where the Earth goes between the Sun and the Moon and casts a shadow on the Moon.
For questions about the various phases on the Moon as observed from the Earth, also known as waxing and waning.
Questions regarding the emission of high energy particles or waves through a vacuum or a partice medium.
Questions regarding the visible night sky during nighttime from Earth.
Questions about computer programs that assist modeling and observing the dynamics of astronomy.
Questions about using the Python programming language to solve astronomical problems. General questions about Python are off-topic but might be asked on Stack Overflow.
Questions regarding the bending of light by mass or energy.
Questions about rings of debris that encircle the equatorial regions of some planets.
Questions about the gas that lays between stars in galaxies.
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 neutron stars which emit regular pulses of electromagnetic radiation.
Questions regarding Albert Einstein's theory that posits, among other things, the equivalence of mass and energy.
Questions about quasi-stellar radio sources, active galactic nuclei that are far away and quite old.
Questions about Mercury, the first planet from Earth's sun. Also the smallest major planet in the Solar System.
Questions regarding one of the three forms of space debris, this case a chunk of debris that survives its passage through the atmosphere and lands on a planet intact.
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.