If SpaceX safely launches its Falcon 9 rocket with the Dragon capsule Saturday morning, its two-week test will just be starting. When it gets close to the International Space Station on its third day in orbit, it will practice approaching, then backing off.
If it passes that test, astronauts on the space station will use their robotic arm to grab the Dragon capsule and pull it in to dock. The capsule is carrying 1,014 pounds of food and supplies for the crew.
When Falcon returns, after about two weeks in space, it will splash down in the Pacific Ocean hundreds of miles off the coast of California near San Diego.
Elon Musk will monitor the launch and mission from the SpaceX mission control in Hawthorne, California. He says he won't breathe a sigh of relief until Dragon splashes down.
"If there is any divine being that can influence the outcome of this event," he said, "I will ask for favor from that divine being."