Fil:Tycho-supernova-xray.jpg
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Oprindelig fil (2.400 × 2.400 billedpunkter, filstørrelse: 609 KB, MIME-type: image/jpeg)
Beskrivelse
| Beskrivelse | Tycho's Supernova Remnant. In 1572, the Danish astronomer Tycho Brahe observed and studied the explosion of a star that became known as Tycho's supernova. More than four centuries later, Chandra's image of the supernova remnant shows an expanding bubble of multimillion degree debris (green and red) inside a more rapidly moving shell of extremely high energy electrons (filamentary blue). As a huge ball of exploding plasma, it was Irving Langmuir who coined the name plasma because of its similarity to blood plasma, and Hannes Alfvén who noted its cellular nature. The filamentary blue outer shell of X-ray emitting high-speed electrons is also a characteristic of plasmas. This is a false-colour x-ray image in which the energy levels (in keV) of the x-rays have been assigned colours as follows: Red 0.95-1.26 keV, Green 1.63-2.26 keV, Blue 4.1-6.1 keV. All x-rays images must use processed colours since x-rays (as are radio waves, infra-red) are invisible to the human eye. But they are not invisible to suitable equipment, such as x-ray telescopes. The red and green bands highlight the expanding cloud of plasma with temperatures in the millions of degrees. |
| Dato | Taget den 29. april 2003 |
| Kilde | http://chandra.harvard.edu/photo/2005/tycho/; see also https://www.flickr.com/photos/smithsonian/2941525398/ |
| Forfatter | NASA/CXC/Rutgers/J.Warren & J.Hughes et al. |
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Denne fil er i offentligt domæne i USA fordi den udelukkende er skabt af NASA. NASAs ophavsretspolitik erklærer at materiale udgivet af NASA ikke er omfattet af ophavsret medmindre andet er nævnt. (Se også Template:PD-USGov, NASAs ophavsretspolitik eller JPLs politik for brug af billeder.) |  |
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Old file history
Originally uploaded on the En-Wiki by en:User:Iantresman 12:40, 23 September 2005
Filhistorik
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| Dato/tid | Miniaturebillede | Dimensioner | Bruger | Kommentar | |
|---|---|---|---|---|---|
| nuværende | 22. dec. 2005, 22:57 | | 2.400 × 2.400 (609 KB) | wikimediacommons>Solipsist~commonswiki | Larger 2024x2024 jpeg based on 6.3Mb Tiff at source: http://chandra.harvard.edu/photo/2005/tycho/ |
