Soubor:M57 The Ring Nebula.jpg
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Fotografie + Description: NASA's Hubble Space Telescope has captured the sharpest view yet of the most famous of all planetary nebulae: the Ring Nebula (M57). In this October 1998 image, the telescope has looked down a barrel of gas cast off by a dying star thousands of years ago. This photo reveals elongated dark clumps of material embedded in the gas at the edge of the nebula; the dying central star floating in a blue haze of hot gas. The nebula is about a light-year in diameter and is located some 2000 light-years from Earth in the direction of the constellation Lyra.
- The colors are approximately true colors. The color image was assembled from three black-and-white photos taken through different color filters with the Hubble telescope's Wide Field Planetary Camera 2. Blue isolates emission from very hot helium, which is located primarily close to the hot central star. Green represents ionized oxygen, which is located farther from the star. Red shows ionized nitrogen, which is radiated from the coolest gas, located farthest from the star. The gradations of color illustrate how the gas glows because it is bathed in ultraviolet radiation from the remnant central star, whose surface temperature is a white-hot 120,000 degrees Celsius (216,000 degrees Fahrenheit).
- Date: October 1998
- Source: http://hubblesite.org/newscenter/archive/releases/1999/01/image/a/ (direct link)
- Author: The Hubble Heritage Team (AURA/STScI/NASA)
+ 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 | 24. 3. 2014, 11:19 | | 1 215×1 241 (631 kB) | Student85 (diskuse | příspěvky) | (MW115FOTO) |
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