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New SMD AO Released

NASA HQ Announcement of Opportunity for the Explorer Program: Small Explorers and Missions of Opportunity

“The National Aeronautics and Space Administration (NASA) Science Mission Directorate (SMD) is releasing a NASA Announcement of Opportunity (NNH07ZDA003O), for the Explorer Program: Small Explorers (SMEX) and Missions of Opportunity. NASA expects to select up to three SMEX missions to proceed into Phase B and subsequent mission phases.”