Missions, Hardware, Software, & Sensors: May 2007

NASA's Science Mission Directorate (SMD) plans to release an Announcement of Opportunity (AO) for new Small Explorer (SMEX) missions and Missions of Opportunity in October of this year. The Explorer Program conducts Principal Investigator (PI)-led space science investigations in SMD's astrophysics and heliophysics programs. It is anticipated that approximately six to eight full-mission SMEX investigations will be selected for 4-month Phase A concept studies through this AO.