NGC 2440 -- This is the End... Beautiful Friend
A new image from the Hubble Space Telescope shows the colorful "last hurrah" of a star like our sun. The picture was taken on Feb. 6, 2007, by Hubble's Wide Field and Planetary Camera 2, which was designed and built by NASA's Jet Propulsion Laboratory in Pasadena, California.
The star is ending its life by casting off its outer layers of gas, which formed a cocoon around the star's remaining core. Ultraviolet light from the dying star makes the material glow. The burned-out star, called a white dwarf, is the white dot in the center. Our sun will eventually burn out and shroud itself with stellar debris, but not for another 5 billion years.
Our Milky Way galaxy is littered with these stellar relics, called planetary nebulae. The objects have nothing to do with planets. Eighteenth and nineteenth-century astronomers named them "Planetary Nebulas" because through small telescopes they resembled the disks of the distant planets Uranus and Neptune. There are over 1500 known planetary nebulas in our Milky Way Galaxy. The first planetary nebula, M27 - The Dumbell Nebula, was discovered by Charles Messier in 1764.
The planetary nebula in this image is called NGC 2440. The white dwarf at the center of NGC 2440 is one of the hottest stars known, with a surface temperature of nearly 200,000 degrees Celsius (400,000 degrees Fahrenheit). The nebula's chaotic structure suggests that the star shed its mass at different times, and not all at once. During each outburst, the star expelled material in a different direction. This can be seen in the two bow tie-shaped lobes. The nebula also is rich in clouds of dust, some of which form long, dark streaks pointing away from the star. NGC 2440 lies about 4,000 light-years from Earth in the direction of the constellation Puppis.
The material expelled by the star glows with different colors depending on its composition, its density and how close it is to the hot central star. Blue corresponds to helium; blue-green to oxygen, and red to nitrogen and hydrogen.
For more info:
http://www.nasa.gov/mission_pages/hubble/news/wfpc-20070213.html
http://www.spacetelescope.org/news/html/heic0703.html
http://www.jpl.nasa.gov/news/news.cfm?release=2007-016
http://hubblesite.org/newscenter/archive/releases/2007/09
The star is ending its life by casting off its outer layers of gas, which formed a cocoon around the star's remaining core. Ultraviolet light from the dying star makes the material glow. The burned-out star, called a white dwarf, is the white dot in the center. Our sun will eventually burn out and shroud itself with stellar debris, but not for another 5 billion years.
Our Milky Way galaxy is littered with these stellar relics, called planetary nebulae. The objects have nothing to do with planets. Eighteenth and nineteenth-century astronomers named them "Planetary Nebulas" because through small telescopes they resembled the disks of the distant planets Uranus and Neptune. There are over 1500 known planetary nebulas in our Milky Way Galaxy. The first planetary nebula, M27 - The Dumbell Nebula, was discovered by Charles Messier in 1764.
The planetary nebula in this image is called NGC 2440. The white dwarf at the center of NGC 2440 is one of the hottest stars known, with a surface temperature of nearly 200,000 degrees Celsius (400,000 degrees Fahrenheit). The nebula's chaotic structure suggests that the star shed its mass at different times, and not all at once. During each outburst, the star expelled material in a different direction. This can be seen in the two bow tie-shaped lobes. The nebula also is rich in clouds of dust, some of which form long, dark streaks pointing away from the star. NGC 2440 lies about 4,000 light-years from Earth in the direction of the constellation Puppis.
The material expelled by the star glows with different colors depending on its composition, its density and how close it is to the hot central star. Blue corresponds to helium; blue-green to oxygen, and red to nitrogen and hydrogen.
For more info:
http://www.nasa.gov/mission_pages/hubble/news/wfpc-20070213.html
http://www.spacetelescope.org/news/html/heic0703.html
http://www.jpl.nasa.gov/news/news.cfm?release=2007-016
http://hubblesite.org/newscenter/archive/releases/2007/09
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