Their company, Reaction Engines, Ltd., set out to develop an SSTO space plane called Skylon. (scientificamerican.com)
SpaceX's most recent rocket landing occurred Sept. 6 after the launch of an Air Force X-37B space plane. (scientificamerican.com)
Further ahead, NASA's Orbital Space Plane, planned for a 2012 launch, might be able to travel to lunar orbit, depending on the final design. (discovermagazine.com)