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 TRUTHS satellite carries two main instruments: the Cryogenic Solar Absolute Radiometer (CSAR) and the Hyperspectral Imaging Spectrometer (HIS) as well as a novel onboard calibration system. Together, these instruments will make continuous measurements of both incoming solar radiation and Earth’s reflected radiation. These two observations will be used to evaluate the energy-in to energy-out ratio. The unprecedented quality of these measurements will be the standard reference against which all other imaging satellites can adjust and correct their own observations. The spatial and spectral resolution of the mission will also accelerate our understanding of the causes of change in energy balance and help assess progress stemming from climate action.