In astronomy, distance can be measured in several different units including meters (m\text{m}m), parsecs (pc\text{pc}pc), light-years (ly\text{ly}ly), and astronomical units (AU\text{AU}AU). Which one of the following distances is the largest?
2.52×1016 m2.52 \times 10^{16}\text{ m}2.52×1016 m
0.780 pc0.780\text{ pc}0.780 pc
2.85 ly2.85\text{ ly}2.85 ly
1.25×105 AU1.25 \times 10^5\text{ AU}1.25×105 AU
66 exam-style questions on OCR A A Level Physics Astrophysics and cosmology, covering Stars, Electromagnetic radiation from stars, and Cosmology. Each one has a worked solution and a mark scheme showing where the marks go.