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File:Centre of NGC 2440.jpg

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English: NGC 2440 is a planetary nebula ejected by a dying star. The central star of NGC 2440 is one of the hottest known, with a surface temperature near 200,000 degrees Celsius. The complex structure of the surrounding nebula suggests to some astronomers that there have been periodic oppositely directed outflows from the central star. In the case of NGC 2440 these outflows have been episodic, and in different directions during each episode. The nebula is also rich in clouds of dust, some of which form long, dark streaks pointing away from the central star. In addition to the bright nebula, which glows because of fluorescence due to ultraviolet radiation from the hot star, NGC 2440 is surrounded by a much larger cloud of cooler gas which is invisible in ordinary light but can be detected with infrared telescopes. NGC 2440 lies about 4,000 light-years from Earth in the direction of the constellation Puppis.
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Source http://heritage.stsci.edu/1999/38/big.html
Author NASA and The Hubble Heritage Team (STScI/AURA)
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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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18 November 1995

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current08:55, 12 September 2011Thumbnail for version as of 08:55, 12 September 2011746 × 754 (418 KB)Rbrausse{{Information |Description ={{en|1=NGC 2440 is a planetary nebula ejected by a dying star. The central star of NGC 2440 is one of the hottest known, with a surface temperature near 200,000 degrees Celsius. The complex structure of the surrounding nebul

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