Gallery: Antares rocket explodes

Engineers erected a commercial Antares rocket vertical on its launch pad on Virginia’s Eastern Shore Friday, positioning the 13-story booster for liftoff Sunday night with more than 5,000 pounds of supplies and experiments for the International Space Station.

A commercial supply ship owned and operated by Orbital ATK departed the International Space Station on Friday, heading for a destructive re-entry over the Pacific Ocean with more than 1.5 tons of trash. The station’s robotic arm released Cygnus at 1226 GMT (7:26 a.m. EST).

NASA has signed a $187 million contract with Northrop Grumman to complete the preliminary design of a pressurized crew habitat for the planned Gateway mini-space station near the moon, and agency officials have discussed new details about plans to launch first two Gateway modules on a single heavy-lift rocket.