This image, a blend of visible and near-infrared light, displays the Triangulum galaxy's central region, which is aglow with the light of at least 15 million individually resolved stars. The detailed portrait represents the largest high-resolution mosaic image of Triangulum ever assembled.
Triangulum is the third largest galaxy in the Local Group, behind the Milky Way and Andromeda. It resides about 3 million light-light-years from Earth, in the northern constellation of Triangulum (the Triangle).
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Hubblesite press release: Triangulum Galaxy Shows Stunning Face in Detailed Hubble Portrait