SpaceX’s Falcon 9 rocket on pad 39A Sunday night. Credit: Michael Cain / Spaceflight Now / Coldlife Photography
SpaceX scrubbed the launch from Florida of a four-man crew heading to the International Space Station early Monday with less than three minutes remaining in the countdown, delaying the start of a six-month mission to examine a problem with a ground system needed to ignite the Falcon 9 rocket’s main engines.