Last Updated:
Correct Answer: Option A — Sun. Sun is correct because it is a G-type main-sequence star. It is also associated with the star at the centre of the Solar System. Together, these two facts identify Sun precisely within Universe. Why the other options are incorrect: Option B — Sirius: Sirius is a binary star system. It is also associated with located in the constellation Canis Major, so these facts identify Sirius rather than Sun. Option C — Proxima Centauri: Proxima Centauri is a red dwarf star. It is also associated with part of the Alpha Centauri stellar system, so these facts identify Proxima Centauri rather than Sun. Option D — Polaris: Polaris is a Cepheid variable star. It is also associated with located in Ursa Minor, so these facts identify Polaris rather than Sun. Exam Takeaway: Link Sun with “a G-type main-sequence star” and “the star at the centre of the Solar System” for quick revision.
