The transport carrier containing NASA’s Plankton, Aerosol, Cloud, ocean Ecosystem (PACE) observatory spacecraft arrives at the Astrotech Space Operations Facility near the agency’s Kennedy Space Center in Florida on Tuesday, Nov. 14, 2023. PACE was shipped from the agency’s Goddard Space Flight Center in Greenbelt, Maryland, and is targeted to launch on January 30, 2024, on a SpaceX Falcon 9 rocket lifting off from Space Launch Complex 40 at Cape Canaveral Space Force Station. The PACE observatory will help us better understand how the ocean and atmosphere exchange carbon dioxide, measure key atmospheric variables associated with air quality and Earth's climate, and monitor ocean health, in part by studying phytoplankton, tiny plants and algae that sustain the marine food web.