Live coverage: Rosetta’s final hours

With the flagship-class ExoMars program nearing the finish line after a decade in development, European Space Agency officials want to complete negotiations with the mission’s industrial teams before committing to a 2018 launch date for a European-built Mars rover.

Europe’s Rosetta spacecraft is trying to contact the Philae landing probe for the first time since the robot fell silent after a bouncy landing on a comet in November.

Russian rocket technicians planned to swap out a failed inertial measurement unit inside a Soyuz rocket overnight Sunday after a failure in the navigation system forced officials to abort the booster’s planned launch of five satellites from French Guiana.