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The Ring Nebula Is a Planetary Nebula That Currently Has

Question 57

Multiple Choice

The Ring Nebula is a planetary nebula that currently has a radius of 0.4 pc and an expansion velocity of 250 km/s.Approximately how long ago did its parent star die and eject its outer layers?


A) 1,600 years ago
B) 3,200 years ago
C) 5,400 years ago
D) 28,000 years ago

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