SpaceX's successful Friday launch opens weekend doubleheader

The year’s not half over, and Elon Musk’s Space Exploration Technologies is about to launch more missions than it completed in all of 2016.
 
SpaceX successfully fired up a Falcon 9 rocket for the eighth time this year on Friday, matching its flight total for all of last year. Its next launch is scheduled just two days later, with the ramped-up cadence putting the company on track to achieve the 20 to 24 total missions it’s targeting for the year.
 
The quickening pace of launches illustrates how SpaceX has bounced back after one of its rockets and a