Buy this White Dwarf NGC 2440 space photo.
High quality Hubble picture, slide, or Duratrans backlit transparency. NASA photograph H99-38. Wide variety of sizes. Click to see selection as Astronomy Picture of the Day (APOD) - May 7, 2006
NGC 2440 is another planetary nebula ejected by a dying star, but it has
a much more chaotic structure than NGC 2346. 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, somewhat similar to that in NGC
2346, but 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
NGC 2440 lies about 4,000 light-years from Earth in the
direction of the constellation Puppis.
The Hubble Heritage team made this image from observations of NGC 2440
acquired by Howard Bond (STScI) and Robin Ciardullo (Penn State).
October 7, 1999
Image Credit: NASA/The Hubble Heritage Team (AURA/STScI).