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English: An X-ray image of the Sirius star system located 8.6 light years from Earth. This image shows two sources and a spike-like pattern due to the support structure for the transmission grating. The bright source is Sirius B, a white dwarf star that has a surface temperature of about 25,000 degrees Celsius which produces very low energy X-rays. The dim source at the position of Sirius A – a normal star more than twice as massive as the Sun – may be due to ultraviolet radiation from Sirius A leaking through the filter on the detector. In contrast, Sirius A is the brightest star in the northern sky when viewed with an optical telescope, while Sirius B is 10,000 times dimmer. Because the two stars are so close together Sirius B escaped detection until 1862 when Alvan Clark discovered it while testing one of the best optical telescopes in the world at that time.
Күні
Көзі CHANDRA X-ray Observatory CXC Operated for NASA by SAO, url=http://chandra.harvard.edu/photo/2000/0065/index.html
Авторы NASA/SAO/CXC
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Image is 77 x 62 arcsec across. RA 06h 45m 11s Dec -16° 42' 05.00" in Canis Major. Observation date: October 28, 1999. Instrument:ACIS.

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Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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суреттелген нәрсе

inception ағылшын тілі

26 қыркүйек, 2000

MIME type ағылшын тілі

image/jpeg

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қазіргі06:16, 2009 ж. қарашаның 2706:16, 2009 ж. қарашаның 27 кезіндегі нұсқасының нобайы420 × 331 (248 КБ)Marshallsumter{{Information |Description={{en|1=An X-ray image of the Sirius star system located 8.6 light years from Earth. This image shows two sources and a spike-like pattern due to the support structure for the transmission grating. The bright source is Sirius B,

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