Photos: Atlas 5 rocket on the pad with WorldView 4 satellite

The Orbital ATK’s Cygnus commercial resupply spacecraft, named the SS Deke Slayton II, is packed up and poised for launch to the International Space Station.

Learn more about the United Launch Alliance Delta 4-Heavy rocket as it prepares to perform the classified NROL-37 mission for the National Reconnaissance Office,

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.