Copernicus Sentinel-6 Michael Freilich satellite undergoing testing at the cleanroom of IABG, Ottobrunn, Germany. The Sentinel 6 program consists of 2 identical satellites that will measure sea surface levels and sea ice thickness. Each satellite carries a radar altimeter to provide high-precision and timely observations of the topography of the global ocean in an effort to better understand and monitor climate change. The first Sentinel 6 satellite was launched in 2020. The second Sentinel 6 satellite is scheduled for launch in 2026.