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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The Traceable Radiometry Underpinning Terrestrial- and Helio-Studies mission, or TRUTHS for short, will provide traceable International System of Units (SI) measurements of incoming solar radiation and of radiation reflected from Earth back out into space, with which to calibrate data from other satellites. In effect, this new satellite will provide the benchmark reference for radiation measurements to improve our understanding of climate change and help increase the precision of climate models. This will help to monitor the effectiveness of international policy to fight the climate crisis.