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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Corrections from Earth: The remaining antenna is a small disc to the top right of the navigation antenna: this is the C-band antenna that receives navigation messages from the ground. Typically updated once every 45 minutes, these messages are crucial to maintaining Galileo’s accuracy. They incorporate corrections to any errors in the onboard atomic clocks or orbital changes of the satellites, as well as information on any satellites temporarily going out of service, to be retransmitted to user receivers within Galileo signals.
#TwelveThingsYouNeverKnewAboutGalileoSatellites