NASA's ICON: Countdown to T-Zero for a Mission to Study Space Weather

Where does Earth's atmosphere end and space begin? This and other questions soon will be answered by NASA’s Ionospheric Connection Explorer, or ICON, satellite. Get ready to watch as the Pegasus countdown reaches T-Zero from its carrier aircraft flying near the Kennedy Space Center. Learn more about the mission that launched on Oct. 10, 2019: https://www.nasa.gov/icon