The current suite of Sentinel missions are at the heart of the European Copernicus programme. Data from the Copernicus Sentinels, which are developed by ESA, feed into the Copernicus Services, which help address challenges such as urbanisation, food security, rising sea levels, diminishing polar ice, natural disasters and, of course, climate change. Looking to the future, six Sentinel Expansion missions are being studied to address European Union policy and gaps in Copernicus user needs, and to expand the current capabilities of the Copernicus Space Component.