This is the planetary nebula NGC 2440. It is 4000 light years from earth and is …


This is the planetary nebula NGC 2440. It is 4000 light years from earth and is located in the constellation Puppis. The star at the center is one of the hottest known white dwarfs in the galaxy. The nebula was discovered in 1790 by William Herschel.

Credit: NASA

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