Explanation:
Taken by a telescope onboard NASA's Swift satellite, this stunning vista
represents the highest resolution image ever made of the Andromeda Galaxy (aka
M31) - at ultraviolet wavelengths. The mosaic is composed of 330 individual
images covering a region 200,000 light-years wide. It shows about 20,000
sources, dominated by hot, young stars and dense star clusters that radiate
strongly in energetic ultraviolet light. Of course, the Andromeda Galaxy is the
closest large spiral galaxy to our own Milky Way, at a distance of some 2.5
million light-years. To compare this gorgeous island universe's appearance in
optical light with its ultraviolet portrait, just slide your cursor over the
image.
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