Already tested as a cargo carrier, the Dragon spacecraft can also be fitted out to shuttle passengers to low orbit and to the International Space Station. See how SpaceX's Dragon capsules work in this SPACE.com infographic.
NASA's Mars Science Laboratory, also known as the Curiosity Mars rover, is a huge six-wheeled robot the size of a small car. The nuclear-powered rover won't land using rockets or airbags like past Mars missions. Instead, NASA has built a rocket-propelled sky crane that will hover over the Martian surface and lower the rover to the Red Planet's surface.