Photos: Atlas 5 rocket aims for International Space Station

A Progress supply craft loaded with 3.1 tons of cargo lifted off Thursday from Kazakhstan, launching on a six-hour pursuit of the International Space Station culminating with a smooth docking to the research lab’s aft port.

A United Launch Alliance Delta 4-Heavy rocket blasted off from Cape Canaveral at 1:51 p.m. EDT (1751 GMT) today to haul a classified satellite into space for the U.S. National Reconnaissance Office. Follow the mission in our live journal.

A balky interplanetary seismic instrument that ran into technical problems in 2015, forcing a two-year delay in the launch of NASA’s InSight lander to Mars, cleared a major test last week after engineers redesigned part of the sensor package, boosting confidence that the mission will be ready to blast off in May 2018.