During the past 10 years, Presidents George W. Bush and Obama have directed NASA to turn the job of transporting cargo and crew to the space station over to the private sector. As that process gathers pace, here is a list of the key players.
NASA's Magnetospheric Multiscale mission uses four satellites flying in a pyramid formation to study explosive events in the magnetic fields around our planet.
NASA's four Earth-orbiting Magnetospheric Multiscale satellites will study explosive magnetic reconnection events, which can damage satellites and interfere with power grids.
NASA's Soil Moisture Active Passive satellite will have to wait to go into space, as high winds forced the agency to abort the launch minutes before liftoff.
SpaceX has released a new computer-generated animation showing the Falcon Heavy rocket, which is designed to have all three of its boosters touch down softly near the launch pad.
A problem with an actuator on the second stage of the company's Falcon 9 rocket prompted the launch of a space station resupply mission to be scrubbed minutes before liftoff.
What would it have looked like to ride in the Orion capsule as it plummeted back to Earth? New NASA footage offers a unique view.
After a maiden voyage that took it some 3,600 miles above the Earth's surface, the Orion spacecraft will remain on Earth while NASA engineers work to improve its design for a trip to the moon.
NASA's Orion deep-space exploration craft has successfully splashed down after blasting its way past low-Earth orbit.
The United Launch Alliance and NASA postponed launch of the Orion deep-space exploration craft until Friday after three false starts on Thursday morning.
The Orion capsule is NASA's new vehicle for human spaceflight. Its aim is fresh: sending astronauts to the moon and beyond. But it looks a lot like Apollo.