Which Universe term is correctly associated with classification or identity: “a unit of distance”, and also with “used for distances between stars and galaxies”?

Correct Answer: Option A — Light-year. Light-year is correct because it is a unit of distance. It is also associated with used for distances between stars and galaxies. Together, these two facts identify Light-year precisely within Universe. Why the other options are incorrect: Option B — Milky Way: Milky Way is a barred spiral galaxy. It is also associated with the galaxy containing the Solar System, so these facts identify Milky Way rather than Light-year. Option C — Andromeda Galaxy: Andromeda Galaxy is a spiral galaxy also catalogued as M31. It is also associated with the nearest large galaxy to the Milky Way, so these facts identify Andromeda Galaxy rather than Light-year. Option D — Sun: Sun is a G-type main-sequence star. It is also associated with the star at the centre of the Solar System, so these facts identify Sun rather than Light-year. Exam Takeaway: Link Light-year with “a unit of distance” and “used for distances between stars and galaxies” for quick revision.