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Celestial Album
Relative size and appearance of Sirius A and B
05/29/13

 

NASA artwork representing the relative size and appearance of Sirius A and B. At ten thousand Kelvins, Sirius A is white hot, while at twenty-five thousand Kelvins, Sirius B - a white dwarf - is beyond white-hot, giving off more blue light than other visible wavelengths, and far more ultraviolet radiation than visible light. Sirius B gives off 40 times more radiation per square foot than Sirius B, but is nearly two hundred times smaller, so that Sirius A is ten thousand times brighter. The relative sizes of the two stars are not shown to scale. If they were, Sirius B would be a dot too small to see; instead, the intensity of its radiation is simulated by showing it larger than it would actually appear, if its disk could be imaged. Photo Credit: G. Bacon, ESA, NASA, HubbleSite



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