Sentinel-2B's multispectral instrument being tested to make sure that it is 'light tight' at Europe's spaceport in Kourou, French Guiana. This is just one of the tests the satellite is undergoing as part of a seven-week campaign to prepare it for launch. Liftoff is set for on 7 March at 01:49 GMT (02:49 CET; 22:49 local time on 6 March).