The Flex (Fluorescence Explorer) satellite, built by the Thales Alenia Space (TAS) group, is due to be launched on September 1, 2026 from Kourou, French Guiana, aboard a Vega-C rocket. The project is being carried out as part of the European Space Agency (ESA) missions. Flex will measure the red fluorescence emitted by plants during photosynthesis, a signal invisible to the human eye. This technique allows the health of vegetation to be assessed before plants show visible signs of stress caused