Artist's concept of the U. S. /European Jason-3 spacecraft over the California coast.

Artist's concept of the New Horizons spacecraft as it approaches Pluto and its largest moon, Charon.

Artist's concept of the Lunar Reconnaissance Orbiter.

Artist's concept of an ascent vehicle leaving Mars.

Artist concept of NASA's Mars Science Laboratory Curiosity rover.

An artist's interpretation of the MESSENGER spacecraft at Mercury.

Artist concept of NASA's Mars Science Laboratory Curiosity rover.

Artist's concept of the X-33 after engine shutdown.

Artist's concept of the Atlas V541 launch vehicle in orbit.

Artist's concept of a cargo launch vehicle blast off.

NASA's two Voyager spacecraft exploring a turbulent region of space.

Artist's concept of Cassini observing a sunset on Saturn's moon Titan.

Artist's concept of futuristic weapons technology.

Artist's concept of a lunar cycler.

Artist's concept illustrating the laws of asstrodynamics.

Artist's concept of the James Webb Space Telescope.

Artist's concept of crop circles made by extraterrestrials.

Artist's concept of the Assimilator's Claw in hyperspace.

Artist's concept of a lunar cycler approaching Earth.

Artist's concept of an Orion-drive battleship; Soviet style.

Artist's concept illustrating space travel throughout a distant galaxy.

Artist's concept of aliens helping the Mayans build complex buildings.

Artist's concept of the next generation Deep Space Vehicle's command module.

Artist's concept of Grey aliens helping the Egyptians build the pyramids.

Artist's concept of NASA's MAVEN spacecraft.