The gas shell of a planetary nebula is expanding away from
The gas shell of a planetary nebula is expanding (away from the central star) at 20 km/s. The nebula currently has a diameter of 1 light year. What is the age of the planetary nebula(time since the gas was ejected)?
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the gas shell of a planetary nebula is expanding away from the central star at 20 kms the nebula currently has a
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need help with the following questions by describing the evolution of earth the sun the moon planets and other bodies
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