The European Space Agency (ESA) has selected X-ray and gravity-wave observatories as the agency's second and third Large-Class missions for launch in 2028 and 2034, respectively, with a call for mission concepts to begin in 2014. The 20-nation ESA polled Europe's space science community starting in March on what should be the focus areas for the next two L-Class missions. ESA said in a Nov. 28 statement that the winning missions were judged the best of the 32 proposals received and then discussed with science organizations.
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