Live coverage: Falcon 9 rocket launch put on hold

Ready to double its Florida launch capacity with two pads, SpaceX is preparing to loft a reused robotic cargo ship toward the International Space Station Wednesday with a recycled Falcon 9 booster, debuting a rebuilt launch complex knocked offline more than a year ago in a fiery blast during pre-flight testing.

The centerpiece of the James Webb Space Telescope has arrived at NASA’s Johnson Space Center in Houston for a three-month test to ensure the observatory’s sensors and gold-coated mirrors work in the frigid temperatures of deep space.

The commercial SpaceX Dragon cargo-delivery craft with the experimental BEAM module — the Bigelow Expandable Activity Module — arrives at the International Space Station two days after launching from Cape Canaveral.