The Dragon spacecraft, operated by California-based Space Exploration Technologies (SpaceX), is the first private spacecraft to berth with the International Space Station. It ships cargo to the station under commercial agreements the company has with NASA.
The company made its first demonstration flight to the station in May 2012, and then began commercial fights that fall. SpaceX is currently contracted with NASA to do 12 robotic supply flights to the station for a minimum of $1.6 billion.
While SpaceX is busy ferrying cargo to and from the station, the company is also working on a plan to put astronauts on the Dragon spacecraft. SpaceX officials are hoping to bring astronauts into space as early as 2015.
Roll the clock back to 2002, when SpaceX was founded, and you can see how much perceptions of private spaceflight have changed. SpaceX founder Elon Musk has said he named the Dragon spacecraft after the song "Puff, the Magic Dragon", a 1960s tune from folk group Peter, Paul and Mary.
Musk chose the name, he said, because critics considered his business plan impossible when he founded SpaceX. In fact, Musk and SpaceX kept Dragon's first 18 months of development secret as the company publicly developed its light Falcon 1 and heavy-lift Falcon 9 rockets.
The news became public in March 2006 after SpaceX and several teammates submitted a proposal for NASA's Commercial Orbital Transportation Services (COTS) demonstration program. NASA accepted the SpaceX's proposal, and that of another company, in August 2006.
What SpaceX proposed to do was fly the Dragon spacecraft on three Falcon 9 rocket flights — a rocket that was still under development. At the time, SpaceX planned to fly those flights in the 2008-09 timeframe, but the design, approval and milestone process took years longer than anticipated.
Dragon passed a NASA critical design review in October 2007, marking a key milestone as this is when the shape of the spacecraft is determined. The next month, SpaceX broke ground for a launch site at Cape Canaveral Air Force Station. This would be the launching pad for Falcon 9 and Dragon, when the time was right.
Flurry of flight activity
As Dragon development moved forward, NASA offered more funding in several forms. In April 2008, NASA awarded SpaceX a launch services contract.
Dubbed "indefinite delivery/indefinite quality," the pact allowed for NASA to order anywhere between $20,000 and $1 billion worth of launches from SpaceX through December 2012. "[SpaceX] can compete for NASA missions using the Falcon 1 and Falcon 9 launch vehicles," the firm stated.
Then came a large breakthrough. In December 2008, NASA selected Space X's Falcon 9/Dragon combination for cargo resupply to the International Space Station. The contract was for a minimum of $1.6 billion, with the option to extend services to up to $3.1 billion. Musk stated it was a "tremendous responsibility" for SpaceX, given the approaching retirement of the shuttle program.
The firm placed some communications hardware on the STS-129 shuttle flight in November 2009 to assist with future SpaceX flights to the station. SpaceX launched the Falcon 9 rocket for the first time in June 2010. This flight included a "qualification unit" of the Dragon spacecraft that was primarily supposed to transmit data during its ride into space.
With the test unit successfully flown, SpaceX turned its attention to sending up the real thing. The first full-up test of the Dragon spacecraft came on Dec. 8, 2010. The mission was a success. It marked the first time a private unmanned space capsule was recovered safely back on Earth. [Infographic: How SpaceX's Dragon Space Capsule Works]
With the world watching, SpaceX prepared to send the first cargo demonstration flight to the station in May 2012. An abort took place after a problem was detected in one of the engines, pushing back the launch a few days. The spacecraft made it into orbit on May 22.
Three days later, Dragon made its final approach to the station. The spacecraft experienced some problems with its laser distance-judging system when the laser got "distracted" and began bouncing signals off the wrong part of the station. SpaceX controllers then narrowed Dragon's view, and the approach proceeded.
Don Pettit, an astronaut on the orbiting outpost, manipulated the station's robotic arm to grab Dragon. He carefully reached out to the spacecraft and finally captured it, as footage played live from space on NASA Television and other webcasts.
"Houston, Station, it looks like we've got us a dragon by the tail," Pettit said at the time, as mission controllers at NASA applauded the feat.
NASA administrator Charles Bolden called the milestone a significant step forward for the agency. "By handing off space station transportation to the private sector, NASA is freed up to carry out the really hard work of sending astronauts farther into the solar system than ever before," he stated.
Dragon's first official supply run took place in October 2012. While the spacecraft made it into orbit safely, Falcon 9 experienced a problem with one of its rocket engines during flight. SpaceX adjusted the trajectory of the rocket to put Dragon on the right path. Dragon berthed with the station, and then splashed down successfully weeks later in the Pacific Ocean near California.
SpaceX's focus in the next few years will be safely running cargo transportation to and from the International Space Station. The early flights have mostly been successful, but the company will need to continue proving its worth to earn more contracts from NASA.
Early indications are looking good, though. In April 2011, SpaceX received $75 million from NASA for creating a launch escape system for Dragon, under the Commercial Crew Development (CCDev) program.
The company first announced 2014 as its target launch date for human spaceflight, but that has now been pushed back to at least 2015. SpaceX has said it is making great strides to getting people on board the spacecraft.
"We're going great guns, we're working very hard, and we hope to have people flying very soon inside the Dragon," SpaceX's commercial crew project manager, Garrett Reisman, said in October 2012.
— Elizabeth Howell, SPACE.com Contributor