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 radar image captures volcanoes dotted across the landscape in Tanzania, including the distinctive Ol Doinyo Lengai (at lower left), in the Great Rift Valley of East Africa. The Gelai Volcano (2942 m) is visible at the top, and the Kitumbeine Volcano (1770 m) is southeast of Gelai.
Radar images represent surface backscatter rather than reflected light, so there is no colour in a standard radar image. This image was created by combining three Envisat Advanced Synthetic Aperture Radar acquisitions (3 February 2010, 30 December 2009 and 25 November 2009) of the same area. The colours result from changes in the surface between acquisitions.