Video: DSCOVR prepared for launch

A problem with a U.S. Air Force tracking radar kept a Falcon 9 rocket crowned with a NOAA space weather observatory grounded Sunday, forcing a long-delayed mission to stay on Earth an extra day.

Officials from SpaceX, NOAA, NASA and the U.S. Air Force hold the prelaunch news conference for Falcon 9 rocket launch of the Deep Space Climate Observatory.

A new space weather observatory launched in February has completed a four-month journey to an operating post a million miles from Earth, NOAA announced Monday.