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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This Envisat image features Alaska’s Yukon Delta, where the Yukon River fans out into a labyrinth of distributaries before emptying into the Bering Sea. The Yukon, North America’s fifth-longest river system, flows some 3190 km across central Alaska in the US before emptying into Norton Sound (top left).
This image was created by combining three Envisat's Advanced Synthetic Aperture Radar (ASAR) acquisitions (19 November 2009, 8 April 2010 and 13 May 2010) over the same area. The colours represent changes in the surface between acquisitions.