A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/s. What is the approximate age of this planetary nebula? (1 pc is equal to 3 × 1013 km and 1 year is equal to 3.15 × 107 seconds.)
A) 240 years
B) 790,000 years
C) 96,000 years
D) 960 years
E) 24,000 years
Correct Answer:
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A)a planetary nebula.
B)a Bok
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A)in planetary nebulae.
B)by red
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A) produces an absorption spectrum.
B)
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A)the
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A)objects with temperature
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