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Soubor:NGC 2440 by HST.jpg
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Fotografie + Description:
- English: The planetary nebula NGC 2440 as photographed by the Hubble Space Telescope.
- Norsk nynorsk: Den planetariske tåka NGC 2440 fotografert av Hubble-teleskopet.
- Original caption
- This image, taken by NASA's Hubble Space Telescope, shows the colorful "last hurrah" of a star like our Sun. 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 nebulae because through small telescopes they resembled the disks of the distant planets Uranus and Neptune. The planetary nebula in this image is called NGC 2440. The white dwarf at the center of NGC 2440 is one of the hottest known, with a surface temperature of nearly 400,000 degrees Fahrenheit (200,000 degrees Celsius). The nebula's chaotic structure suggests that the star shed its mass episodically. 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 image was taken Feb. 6, 2007 with Hubble's Wide Field Planetary Camera 2. The colors correspond to material expelled by the star. Blue corresponds to helium; blue-green to oxygen; and red to nitrogen and hydrogen.
- Date: 6 February 2007
- Source: http://hubblesite.org/image/2058/news_release/2007-09
- Author: NASA, ESA, and K. Noll (STScI)
+ pochází z Wikimedia Commons, kde má status – This file is in the public domain because it was created by NASA and ESA. NASA Hubble material (and ESA Hubble material prior to 2009) is copyright-free and may be freely used as in the public domain without fee, on the condition that only NASA, STScI, and/or ESA is credited as the source of the material. This license does not apply if ESA material created after 2008 or source material from other organizations is in use.
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| Datum a čas | Náhled | Rozměry | Uživatel | Komentář | |
|---|---|---|---|---|---|
| současná | 12. 4. 2019, 17:55 | | 1 241×1 207 (1,32 MB) | Sysop (diskuse | příspěvky) | (Fotografie + Description: * English: The planetary nebula NGC 2440 as photographed by the Hubble Space Telescope. * Norsk nynorsk: Den planetariske tåka NGC 2440 fotografert av Hubble-teleskopet. * Original caption ** This image, taken by NASA's Hubble ) |
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