2MASS Image of 47 Tucanae
Autor:
2MASS/T. Jarrett
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2034 x 2038 Pixel (1176367 Bytes)
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47 Tucanae is the second brightest "globular cluster" visible from Earth, though it can only be seen from the Southern Hemisphere. Globular clusters are particularly large, dense collections of thousands, even millions of stars that are so tightly bound together by gravity that they stay together for billions of years.
Located about 20,000 light years from Earth, 47 Tucanae remains impressive due to its sheer size, containing around a million stars. Only a small fraction of the very brightest ones can be seen in this image. About half of its stars fall within a region 25 light years across though the entire cluster spans well over 100 light years.
This image is 34 arcminutes across, just over half a degree. The infrared colors of these stars are very uniform, showing almost no variation.
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Public domain
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2MASSProjekt Two Micron All-Sky Survey, známý pod zkratkou 2MASS, byl astronomickým průzkumem celé oblohy v infračerveném spektru, jeden z nejambicióznějších projektů tohoto druhu. .. pokračovat ve čtení