Which Universe term is correctly associated with location or association: “used for distances between stars and galaxies”, and also with “the distance light travels in one year”?

Correct Answer: Option B — Light-year. Light-year is correct because it is used for distances between stars and galaxies. It is also associated with the distance light travels in one year. Together, these two facts identify Light-year precisely within Universe. Why the other options are incorrect: Option A — Milky Way: Milky Way is the galaxy containing the Solar System. It is also associated with Sagittarius A* lies at its centre, so these facts identify Milky Way rather than Light-year. Option C — Andromeda Galaxy: Andromeda Galaxy is the nearest large galaxy to the Milky Way. It is also associated with it is visible from Earth without a telescope under dark skies, so these facts identify Andromeda Galaxy rather than Light-year. Option D — Sun: Sun is the star at the centre of the Solar System. It is also associated with the photosphere is its visible surface, so these facts identify Sun rather than Light-year. Exam Takeaway: Link Light-year with “used for distances between stars and galaxies” and “the distance light travels in one year” for quick revision.