Which Universe term is correctly associated with important feature: “associated with a supernova observed in 1054 CE”, and also with “it contains the Crab Pulsar”?

Correct Answer: Option C — Crab Nebula. Crab Nebula is correct because it is associated with a supernova observed in 1054 CE. It is also associated with it contains the Crab Pulsar. Together, these two facts identify Crab Nebula precisely within Universe. Why the other options are incorrect: Option A — Black hole: Black hole is its boundary is called the event horizon. It is also associated with its gravity strongly bends spacetime, so these facts identify Black hole rather than Crab Nebula. Option B — Light-year: Light-year is the distance light travels in one year. It is also associated with approximately 9.46 trillion kilometres, so these facts identify Light-year rather than Crab Nebula. Option D — Milky Way: Milky Way is Sagittarius A* lies at its centre. It is also associated with it belongs to the Local Group, so these facts identify Milky Way rather than Crab Nebula. Exam Takeaway: Link Crab Nebula with “associated with a supernova observed in 1054 CE” and “it contains the Crab Pulsar” for quick revision.