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The highest resolution image of our neighbouring spiral galaxy, M31, allows us to see individual stars in a galaxy 2.5 million million million kilometers away. The full image is 4.3 GB in size and is downloadable from here: http://www.spacetelescope.org/images/heic1502a/ and a great zoomable version is available here: http://www.spacetelescope.org/images/heic1502a/zoomable/
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