EUROPEAN SPACE AGENCY / C. VIJOUX / SCIENCE PHOTO LIBRARY EUROPEAN SPACE AGENCY / C. VIJOUX / SCIENCE PHOTO LIBRARY
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Planck space observatory. Artwork of the European Space Agency's Planck space observatory. This unmanned spacecraft, measuring 4.2 metres by 4.2 metres, was launched on 14 May 2009. It will travel to the second Lagrangian point (L2), situated about 1.5 million kilometres from Earth in the direction opposite to the Sun. The aim of the mission is to study the Cosmic Microwave Background, the radiation left over from the Big Bang.
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