A SpaceX Falcon 9 rocket carrying NASA’s TRACERS (Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites) mission stands vertical Tuesday, July 22, 2025, at Space Launch Complex 4 East at Vandenberg Space Force Base in California. The TRACERS mission will study magnetic reconnection around Earth — a process in which electrically charged plasmas exchange energy in the atmosphere — to understand how the Sun’s solar wind interacts with the magnetosphere, Earth’s protective magnetic shield.