The National Aeronautics and Space Administration (NASA) Science Mission Directorate (SMD) announces the release of an Announcement of Opportunity (AO) to solicit Principal Investigator (PI)-led space science investigations for the Small Explorer (SMEX) opportunity under the Astrophysics Explorers Program. The SMD strategic goal of expanding human knowledge through new scientific discoveries in astrophysics includes the […] The post NASA Announcement of Opportunity Astrophysics Explorers Program