Europe's latest navigation satellites, launched last December, have been officially commissioned into the Galileo constellation, and are now broadcasting working navigation signals.
Einstein's theory of general relativity is to be put to the test by a newly launched satellite in an experiment that could upend our understanding of physics.
Launched on 25 April from Europe's Spaceport in French Guiana, Sentinel-1B has produced its first images only two hours after the radar was switched on – a record time for a space radar.
Europe will attempt to launch a Russian Soyuz rocket for the fourth time Monday after weather conditions and technical faults halted previous take-offs, launch service Arianespace said.
Sentinel-1B lifted off on a Soyuz rocket, flight VS14, from Europe's Spaceport in French Guiana on 25 April 2016 at 21:02 GMT (23:02 CEST).