Photos: Atlas 5 rolls out for Friday launch to GPS constellation

United Launch Alliance is set to retire part of its rocket family Thursday with the final flight of the Delta 4 rocket’s “single stick” configuration, a mission set for liftoff from Cape Canaveral carrying a new GPS navigation satellite into orbit for the U.S. Air Force.

NASA officials and lawmakers warned Wednesday that U.S. astronauts will continue riding to the International Space Station aboard Russian spacecraft longer than planned if a spending plan under consideration in the Senate becomes law.

DigitalGlobe’s WorldView 4 commercial satellite, which will join sister-craft WorldView 3 in orbit to snap the highest quality Earth imagery available on the market at 31-centimeter resolution, was built by Lockheed Martin and will be launched Friday atop an Atlas 5 rocket from Vandenberg Air Force Base, California.