Suppose a planetary nebula is 4.6 pc in diameter, and Doppler shifts in its spectrum show that the planetary nebula is expanding at 23 km/s. How old is the planetary nebula? (Note: 1 pc = 3.1 ✕ 1013 km and 1 yr = 3.2 ✕ 107 s.)
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Suppose a planetary nebula is 4.6 pc in diameter, and Doppler shifts in its spectrum show that the planetary nebula is expanding at 23 km/s. How old is the planetary nebula? (Note: 1 pc = 3.1 ✕ 1013 km and 1 yr = 3.2 ✕ 107 s.)
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