1. The Crab Nebula is now 1.35 pc in radius and is expanding at 1400 km/s. About when did the supernova occur? (Note that 1 pc equals 3.1 × 10¹³km.)

2. If the Cygnus Loop is 25 pc in diameter and is 10,000 years old, with what average velocity has it been expanding? (Note that 1 pc equals 3.1 ×10¹³km, and 1 year equals 3.2 × 10⁷ seconds, to 2 significant figures.)

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