Watch a replay of the Delta 4 NROL-47 launch

Carrying a Cygnus supply ship bound for the International Space Station, an Orbital ATK Antares rocket lifted off Monday from the Mid-Atlantic Regional Spaceport at Wallops Island, Virginia.

Launch of a SpaceX Crew Dragon capsule carrying four astronauts to the International Space Station has been delayed 24 hours to Friday because of bad weather in the Atlantic Ocean where the crew could be forced to ditch in an emergency, NASA announced Wednesday.

The detective work into the Atlas 5 rocket’s first stage performance trouble during the Cygnus cargo ship launch a week ago has implicated the fuel system as the likely culprit for using up the liquid oxygen supply too quickly.