Sentinel-3C is the third satellite in the Sentinel-3 constellation, which provides high-accuracy optical, radar and altimetry data for marine and land services. The Fluorescence Explorer (FLEX) satellite is a part of ESA's Earth Explorer program. The satellite will map vegetation fluorescence to quantify photosynthetic activity. September 15, 2026 at 01:21 UTC · Launch Successful Vega-C — Avio S.p.A, to Sun-Synchronous Orbit Ariane Launch Area 1 (ELV), Guiana Space Centre, French Guiana The world's 7390th orbital launch attempt, and 217th of 2026. Program: Copernicus https://www.youtube.com/watch?v=Rb4CN2avz90 https://www.youtube.com/watch?v=fmrgyh5s-is Data: Launch Library 2, The Space Devs. Mission patch: via The Space Devs.