Astrium has been commissioned by the European Space Agency to build the Sentinel-2B optical satellite, the next flight unit in the Sentinel series. Sentinel-2 is part of the Global Monitoring for Environment and Security program and will give Europe the ability to monitor environmental changes in the region over an extended period of time. Astrium is responsible for the satellites’ overall system design, multispectral instrument and platform, as well as for satellite integration and testing. Each Sentinel-2 satellite is intended to spend a minimum of 7.25 years in orbit observing the Earth’s land masses. When fully operational, the pair of Sentinel-2 satellites will be able to cover all of the Earth’s land masses in five-day cycles, sending back data and images for a duration of at least 15 years.