A jet stream within the Earth’s core has been discovered by researchers using data from ESA’s Swarm satellite mission. ESA’s Swarm satellites have led the discovery of a jet stream in the liquid iron part of Earth’s core about 1,870 miles beneath the surface. In addition, Swarm data show that this jet stream is speeding up. Image credit: ESA. Launched in 2013, the three Swarm satellites are measuring and untangling the different magnetic fields...