Advanced Search
Astrobiology Magazine Facebook  Astrobiology Magazine Twitter
Celestial Album
Relative size and appearance of Sirius A and B


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

Viewed:  85 times




About Us
Contact Us
Podcast Rss Feed
Daily News Story RSS Feed
Latest News Story RSS Feed
Learn more about RSS
Chief Editor & Executive Producer: Helen Matsos
Copyright © 2014,