1. The Ring Nebula in Lyrae is a planetary nebula with an angular diameter of 76 arc seconds and… 1 answer below »

1. The Ring Nebula in Lyrae is a planetary nebula with an angular diameter of 76 arc seconds and a distance of 5000 ly. What is its linear diameter? (Hint: Use the small-angle formula, Chapter 3.) 2. Suppose a planetary nebula is 1 pc in radius. If the Doppler shifts in its spectrum show it is expanding at 30 km/s, how old is it? (Note that 1 pc equals 3.1 × 1013 km, and 1 year equals 3.2 × 107 seconds, to 2 significant figures.)    

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