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|  |  |  |  | | | ESA pays tribute to 50 years of space 4 October 2007
 | 50 years of Space...from Sputnik...to ISS
Credits: ESA |  |  |  |  |
| | | |  | This Hubble image of the Antennae galaxies is the sharpest yet of this merging pair of galaxies. As the two galaxies smash together, thousands of millions of stars are born, mostly in groups and clusters of stars. The brightest and most compact of these are called super star clusters.
Credits: NASA, ESA, and B. Whitmore (Space Telescope Science Institute) |  |  |  |  |
| | | |  | European Space Agency (ESA) astronaut Thomas Reiter (bottom center), Expedition 13 flight engineer, and the STS-121 crewmembers pose in "star-burst" formation for an in-flight portrait in the Destiny laboratory of the International Space Station while Space Shuttle Discovery was docked with the station. Clockwise, around the circle from Reiter, are astronauts Michael E. Fossum, Lisa M. Nowak, both mission specialists; Steven W. Lindsey and Mark E. Kelly, commander and pilot, respectively; Stephanie D. Wilson and Piers J. Sellers, mission specialists. Reiter launched on the Space Shuttle Discovery with the STS-121 crew and officially became an Expedition 13 crewmember after the shuttle docked with the station.
Credits: NASA |  |  |  |  |
| | | |  | Three legends in space history - JPL's Director William Pickering, scientist James Van Allen and rocket pioneer Wernher von Braun - hold high a model of Explorer 1 to celebrate its launch.
Credits: NASA/Caltech/JPL |  |  |  |  |
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