The Ring Nebula is a planetary nebula in the constellation Lyra. It has an angular size...

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Question

The Ring Nebula is a planetary nebula in the constellation Lyra. It has an angular size of 1.4 arcmin × 1.0 arcmin and is expanding at the rate of about 20 km/s. Approximately how long ago did the central star shed its outer layers? Assume that the nebula is 2700 ly from Earth.

Answer 1

Answer #1

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Answer 2

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