UMBC Earth and Space Institute engineers Yomiyu Fekadu (left) and Danny Nelson (right) prepare the Hyper-Angular Rainbow Polarimeter #2 (HARP2) instrument for thermal vacuum testing at NASA's Goddard Space Flight Center in Greenbelt Maryland on August 8th, 2022. HARP2 is one of three instruments on NASA's Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) observatory, it was designed and built by UMBC's Earth and Space Institute.