Space Exploration Technologies Corporation, or SpaceX, is a space transport company headquartered in Hawthorne, California. It was founded in 2002 by former PayPal entrepreneur Elon Musk. It has developed the Falcon 1 and Falcon 9 launch vehicles, both of which were designed from conception to eventually become reusable. SpaceX also developed the Dragon spacecraft to be flown into orbit by the Falcon 9 launch vehicle, initially transporting cargo and later planned to carry humans.
Contributions by StuffOfInterest, Dschmelzer, and Duk.
SpaceX will try landing the Dragon booster on the barge after Friday's cargo flight.
There has been 18 missions.
Sounds like only once and it was successful. Stayed for about a month.