Sirius A and B: A Double-Star System in the Constellation Canis Major : 無料・フリー素材/写真
Sirius A and B: A Double-Star System in the Constellation Canis Major / Smithsonian Institution
| ライセンス | No known copyright restrictions(著作権制限なし) |
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| 説明 | Description: The Chandra X-ray image of Sirius A & B, a double star system located 8.6 light years from Earth, shows a bright source and a dim source. The central bright source is Sirius B, a dense white dwarf star with a surface temperature of about 25,000 degrees Celsius. The dim source (slightly above and to the right of Sirius B) is Sirius A, a normal star more than twice as massive as the Sun. The spoke-like pattern of light is an instrument artifact due to the transmission grating. The white dwarf, Sirius B, has a mass equal to the mass of the Sun packed into a diameter that is 90% that of the Earth. The gravity on the surface of Sirius B is 400,000 times that of Earth!Creator/Photographer: Chandra X-ray ObservatoryNASA's Chandra X-ray Observatory, which was launched and deployed by Space Shuttle Columbia on July 23, 1999, is the most sophisticated X-ray observatory built to date. The mirrors on Chandra are the largest, most precisely shaped and aligned, and smoothest mirrors ever constructed. Chandra is helping scientists better understand the hot, turbulent regions of space and answer fundamental questions about origin, evolution, and destiny of the Universe. The images Chandra makes are twenty-five times sharper than the best previous X-ray telescope. NASA's Marshall Space Flight Center in Huntsville, Ala., manages the Chandra program for NASA's Science Mission Directorate in Washington. The Smithsonian Astrophysical Observatory controls Chandra science and flight operations from the Chandra X-ray Center in Cambridge, Massachusetts.Medium: Chandra telescope x-rayDate: 2000Persistent URL: chandra.harvard.edu/photo/2000/0065/Repository: Smithsonian Astrophysical ObservatoryCollection: White Dwarfs and Planetary Nebulas CollectionGift line: NASA/CXC/SAOAccession number: sirius |
| 撮影日 | 2008-09-30 10:35:13 |
| 撮影者 | Smithsonian Institution , United States |
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