SpaceX is about to launch its first recycled rocket.
The Falcon 9 rocket is on the pad at Florida's Kennedy Space Center, poised for liftoff.
It's the first time SpaceX founder Elon Musk has tried to fly a salvaged booster. The first stage landed on an ocean platform almost a year ago after a launch for NASA.
SpaceX refurbished and tested the booster, which still has its original engines.
It'll aim for another sea landing once it hoists a broadcasting satellite for the SES (S-E-S) company of Luxembourg.
