Margaret Kivelson, professor emeritus of space physics in the UCLA College, has been awarded the 2019 Jean Dominique Cassini Medal of the European Geosciences Union.

The EGU website describes the award as follows: “The Jean Dominique Cassini Medal & Honorary Membership of the EGU form one of the three equally ranked most prestigious awards made by the Union. They are bestowed to scientists who have achieved exceptional international standing in planetary and space sciences, defined in their widest senses, for their merit and their scientific achievements.”

Kivelson’s studies of Jupiter’s magnetospheric plasmas have allowed scientists to better understand the interiors of planets and their moons. Her discoveries of an ocean inside Jupiter’s moon Europa and a magnetic field generated by neighboring Ganymede, Jupiter’s largest moon, showed that those icy bodies are not inert, but dynamic worlds.