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For this ESA\/Hubble\u00a0Picture of the Week, we gaze upon the field of stars that is NGC 1786. This object is a globular cluster in the Large Magellanic Cloud (LMC), a small satellite galaxy of the Milky Way Galaxy that is approximately 160\u00a0000 light-years away from Earth. NGC 1786 itself is in the constellation\u00a0Dorado. It was discovered in the year 1835 by John Herschel.<\/p>\n
The data for this image comes from an observing programme comparing old\u00a0globular clusters\u00a0in nearby dwarf galaxies \u2014 the LMC, the Small Magellanic Cloud and the\u00a0Fornax dwarf spheroidal galaxy\u00a0\u2014 to the globular clusters in the Milky Way galaxy. Our galaxy contains over 150 of these old, spherical collections of tightly-bound stars, which have been studied in depth \u2014 especially with Hubble Space Telescope images like this one, which show them in previously-unattainable detail. Being very stable and long-lived, they act as galactic time capsules, preserving stars from the earliest stages of a galaxy\u2019s formation.<\/p>\n
Astronomers once thought that the stars in a globular cluster all formed together at about the same time, but study of the old globular clusters in our galaxy has uncovered multiple populations of stars with different ages. In order to use globular clusters as historical markers, we must understand how they form and where these stars of varying ages come from. This observing programme examined old globular clusters like NGC 1786 in these external galaxies to see if they, too, contain multiple populations of stars. This research can tell us more not only about how the LMC was originally formed, but the Milky Way Galaxy, too.<\/p>\n
[Image Description:<\/i>\u00a0A cluster of stars in space. It\u2019s bright in the centre, where the stars are densely packed together in the cluster\u2019s core, and grows dimmer and more diffuse out to the edges, as the stars give way to the dark background of space. A few orange stars are spread across the cluster, but most are pale, bluish-white points of light. Three large stars with cross-shaped spikes around them lie between us and the cluster.]<\/p>\n<\/p><\/div>\n<\/p><\/div>\n