The European Space Agency (ESA) is Europe’s gateway to space. Its mission is to shape the development of Europe’s space capability and ensure that investment in space continues to deliver benefits to the citizens of Europe and the world.
Find out more about space activities in our 23 Member States, and understand how ESA works together with their national agencies, institutions and organisations.
Exploring our Solar System and unlocking the secrets of the Universe
Go to topicProtecting life and infrastructure on Earth and in orbit
Go to topicUsing space to benefit citizens and meet future challenges on Earth
Go to topicMaking space accessible and developing the technologies for the future
Go to topicThe plasma tori of the two satellites are approximated in blue for Tethys (indicating lower energy plasma) and green for Dione (indicating higher energy plasma).
The orbit of Cassini is shown in black with red lines showing the positions of observed inward plasma injections. Butterfly electron pitch-angle distributions consistent with outward plasma flow are observed throughout the regions in between the inward injections.