Live coverage of Delta 4 countdown and launch

Watch a replay of the United Launch Alliance Delta 4 rocket launching from Vandenberg Air Force Base in California, hauling into orbit a new eye in the sky for the National Reconnaissance Office.

Officials have accepted a Friday launch date for a commercial cargo ship to the International Space Station after Range availability scuttled notions of moving up the Atlas 5 flight by a day.

Less than three months after rocketing into space, the commercial WorldView 4 Earth-imagery satellite has finished in-orbit testing and calibration to begin operations for DigitalGlobe.