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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... system of traversing our earthly terrain, seas and oceans long before the age of mapping ... of the perigee and the apogee, the Milky Way, the crab nebula, the life ...
