The photo for this week is Comet Holmes Grows a Tail. Take on November 5, of the impressive comet Holmes which appears to be slightly diminishing in brightness. Its angular extent is calculated to be larger than nearby stars and planets. The comet's coma, or center, appears to be glowing green and turquoise. The photo was captured by a Spain astronomer who used three exposures to show the extent of its magnificent tail. The solar wind creates the tail to glow blue because the impact on the coma.
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