Billionaire Elon Musk suffered another setback Thursday when SpaceX, the company he founded, scrubbed a Falcon 9 launch attempt.
The Block 5's launch window opens at 4:12 p.m. EDT on Thursday, although adverse weather or technical problems could see takeoff delayed to another day. NASA will require seven successful flights of the Block 5 Falcon 9 before it's human rated.
Elon Musk has referred to Block 5 as the "finished version" of its reusable Falcon 9 rockets.
With greater refurbishment, a Block 5 could be launched up to 100 times. The Block 5, however, is created to fly up to 100 times, although this will involve some refurbishment and inspections after every 10 flights.
Known as the Falcon 9 Block 5, the rocket was about 60 seconds from launch at Cape Canaveral in Florida when its ground system went into an "auto-abort" mode due to an unknown technical issue. In the past, SpaceX rockets have been only capable of making about two trips.
Although the company hasn't outlined all the changes, there will be a stronger heat shield for the trip back through the Earth's atmosphere and new retractable landing legs. That's more than half of the estimated overall $62 million price of the Falcon 9, according to various trade publications.
The first crew launch is tentatively planned for December 2018. It will ultimately replace all other SpaceX rockets, as it will be relatively affordable to launch and reuse - at least in theory.