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A look back on the years's launches, space explorations and discoveries.
6 of 31
Astronomers have used NASA's Hubble Space Telescope to photograph the iconic Horsehead Nebula in a new, infrared light to mark the 23rd anniversary of the famous observatory's launch aboard the space shuttle Discovery on April 24, 1990. The iconic Horsehead Nebula has graced astronomy books ever since its discovery more than a century ago. In an image released on April 21, 2013, the rich tapestry of the Horsehead Nebula pops out against the backdrop of Milky Way stars and distant galaxies that easily are visible in infrared light. UPI/ NASA/ESA/Hubble Heritage Team
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