OFICIAL European Space Agency

ESA’s photosynthesis satellite fuelled

What happened
Based on European Space Agency · Aug 20, 2026

The European Space Agency’s FLEX satellite has been fuelled ahead of its 15 September launch, marking a key step toward studying global plant health through photosynthesis measurements.

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ESA’s photosynthesis satellite fuelled
European Space Agency — European Space Agency
Key points
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This signal, invisible to the naked eye, varies with environmental conditions and plant health, enabling scientists to detect vegetation stress before it becomes apparent on the ground.
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FLEX will deliver the first global maps of vegetation fluorescence at a spatial resolution of 300 m × 300 m, providing a new way to assess photosynthetic activity.
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These data will improve understanding of how carbon moves between plants and the atmosphere, and how photosynthesis drives the carbon and water cycles.
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Photosynthesis is one of the planet’s most important natural processes, underpinning food production and absorbing huge quantities of carbon dioxide from the atmosphere.
Key numbers
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The satellite arrived in French Guiana in mid-July alongside the Copernicus Sentinel-3C satellite, both now undergoing final preparations for liftoff aboard a Vega-C rocket.
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5-year mission, during which it will observe at least three seasonal vegetation cycles in both hemispheres.
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Although FLEX and Sentinel-3C will launch together, FLEX will initially operate in tandem with the Sentinel-3A satellite.

The European Space Agency’s FLEX satellite has been fuelled at Europe’s Spaceport in French Guiana ahead of its planned launch on 15 September at 03:21 CEST. The satellite, equipped with a Fluorescence Imaging Spectrometer, will measure faint fluorescence signals emitted by plants during photosynthesis to assess their health and detect stress before visible signs appear. This data will help scientists understand carbon and water cycles, as well as vegetation responses to environmental stresses like drought and heat. The satellite arrived in French Guiana in mid-July alongside the Copernicus Sentinel-3C satellite, both now undergoing final preparations for liftoff aboard a Vega-C rocket.

Fuelling FLEX required loading 30 kg of highly volatile propellant, a hazardous process conducted under strict safety protocols by a specialised team. Frank de Bruin, ESA’s Launch Campaign Manager for FLEX, confirmed the operation was completed successfully, with all non-essential personnel evacuated from the cleanroom during the procedure. The next steps include installing FLEX on its launcher adapter and encapsulating it into the lower position of the Vega-C rocket fairing. The satellite is designed for a minimum 3.5-year mission, during which it will observe at least three seasonal vegetation cycles in both hemispheres.

Although FLEX and Sentinel-3C will launch together, FLEX will initially operate in tandem with the Sentinel-3A satellite. This coordination will provide complementary measurements, including clouds, aerosols, water vapour, land surface temperature, and vegetation parameters. The combined observations aim to deliver an unprecedented global view of vegetation function and condition, enhancing understanding of photosynthetic activity and its role in Earth’s carbon and water cycles.

After years of development, construction, and testing, FLEX is now fully fuelled and nearing launch readiness. The mission represents a significant advancement in Earth observation, offering new tools to monitor plant health and ecosystem dynamics in the face of climate change and environmental pressures.

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