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Many colourful stars are packed close together in this image of the\u00a0globular cluster\u00a0NGC 1805, taken by the\u00a0NASA\/ESA Hubble Space Telescope. This tight grouping of thousands of stars is located near the edge of the\u00a0Large Magellanic Cloud, a satellite galaxy of our own Milky Way. The stars orbit closely to one another, like bees swarming around a hive. In the dense centre of one of these clusters, stars are 100 to 1000 times closer together than the nearest stars are to our Sun, making planetary systems around them unlikely.<\/p>\n
The striking difference in star colours is illustrated beautifully in this image, which combines two different\u00a0 types of light: blue stars, shining brightest in near-ultraviolet\u00a0light, and red stars, illuminated in red and near-infrared. Space telescopes like Hubble can observe in the ultraviolet because they are positioned above Earth\u2019s atmosphere, which absorbs most of this wavelength, making it inaccessible to ground-based facilities.<\/p>\n
This young globular cluster can be seen from the southern hemisphere, in the\u00a0Dorado\u00a0constellation, which is Portugese for dolphinfish. Usually, globular clusters contain stars which are born at the same time; however, NGC 1805 is unusual as it appears to host two different populations\u00a0 of stars with ages millions of years apart. Observing such clusters of stars can help astronomers understand how stars evolve, and what factors determine whether they end their lives as white dwarfs, or explode as supernovae.<\/p>\n