For questions about galaxies (massive, gravitationally-bound groups of stars) or objects and systems that span a similarly large scale.

Galaxies are systems of millions or billions of stars, gas, dust, and other objects, held together by gravity. Questions with this tag are either about galaxies themselves or systems and objects on a similar scale.

Relevant tags include and ,
as well as , , and if the subject of the question is a galactic system.