The Ring Nebula Is a Planetary Nebula That Currently Has

question 64

Multiple Choice

The Ring Nebula is a planetary nebula that currently has a radius of 1.2 × 10¹³ km and an expansion velocity of 250 km/s.Approximately how long ago did its parent star die and eject its outer layers?

• A)1,500 years ago
• B)3,200 years ago
• C)5,400 years ago
• D)8,000 years ago
• E)28,000 years ago

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