Release Date: September 28, 2007
Notice of Intent: November 16, 2007
Proposals Due: January 15, 2008
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. NASA desires to launch the first SMEX mission by late 2011 or 2012; the launch-by date for all SMEX missions is April 30, 2014.