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
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An engineer performs a theodolite position measurement, reflected in the mirrored bottom side of a Galileo Full Operational Capability satellite. Within this panel of the satellite is where Galileo's quartet of atomic clocks are mounted. The white-coloured object seen bottom left is the S-band antenna for telemetry, tracking and telecommand signaling; there is one on each side of the satellite.