Annemarie Eldering, project scientist for the Orbiting Carbon Observatory-3 (OCO-3) at NASA’s Jet Propulsion Laboratory in Pasadena, California, talks to NASA Social participants during a What’s On Board science briefing at the agency’s Kennedy Space Center in Florida on April 29, 2019. The briefing was held for SpaceX’s 17th Commercial Resupply Services (CRS-17) mission to the International Space Station. OCO-3 will be robotically installed on the exterior of the space station’s Japanese Experiment Module Exposed Facility Unit, where it will measure and map carbon dioxide from space to provide further understanding of the relationship between carbon and climate. The SpaceX Falcon 9 rocket and Dragon cargo module are scheduled to launch no earlier than May 3, 2019, from Space Launch Complex 40 on Cape Canaveral Air Force Station in Florida.