A constellation of three satellites form the Swarm Earth Explorer mission. Swarm will identify and measure the magnetic signals that stem from Earth’s core, mantle, crust, oceans, ionosphere and magnetosphere – all of which create the magnetic field that protects our planet. This information will provide insight into processes occurring deep inside the planet and yield a better understanding of the near-Earth electromagnetic environment and the impact solar wind has on Earth. Credits: ESA/AOES Medialab

Understanding the Earth’s Gravity with ESA’s Swarm Satellites

Caitlin Dempsey

The European Space Agency will be launching three satellites next year with the objective of studying the earth's gravity.