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> Star Cluster NGC 1805 in Dorado
Star Cluster NGC 1805 in Dorado
author: ESA/NASA/Novapix
reference: a-agb18-05001
Image Size 300 DPI: 33 * 32 cm
This Hubble Space Telescope picture shows a tight grouping of thousands of stars located near the edge of the Large Magellanic Cloud, a satellite galaxy of our own Milky Way. The striking difference in star colours is illustrated in this image, which combines two different types of light: blue stars, shining brightest in near-ultraviolet light, and red stars, illuminated in red and near-infrared. Space telescopes like Hubble can observe in the ultraviolet because they are positioned above Earth’s atmosphere, which absorbs most of this wavelength, making it inaccessible to ground-based facilities. This young globular cluster can be seen from the southern hemisphere, in the Dorado constellation. 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 of stars with ages millions of years apart.
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