Lunar Reconnaissance Orbiter (LRO) (Artist's Concept)

Artist's Concept of Mars Odyssey Mapping

Mars Reconnaissance Orbiter Aerobraking

Curiosity Touching Down, Artist's Concept

Example of a Spectrum from Curiosity's ChemCam Instrument

Uniting of NuSTAR Spacecraft and Rocket

Mars Science Laboratory Aeroshell with Curiosity Inside

Mars Science Laboratory Powered Descent Vehicle

Potential Sources and Sinks of Methane on Mars

InSight, a Mars MIssion (Artist Concept)

Observing a Rover Pivot Test

Artist's Concept of Mars Exploration Rover

Juno Mission to Jupiter (2010 Artist's Concept)

GRAIL Flying in Formation (Artist's Concept)

Bright Days Ahead for Curiosity Mars Rover

Curiosity at Work on Mars (Artist's Concept)

Testing Sequences of Wheel Turns

'Y Dwarf' Chillin' in Space (Artist's Concept)

Testing of Mars Landing Radar near Lancaster, Calif.

Testing the GRAIL Twins

Calibration Target on Curiosity for Camera on Rover's Arm

Planck Spacecraft (Artist Concept)

Mars Science Laboratory Atop Its Atlas V

Artist's Concept of NuSTAR

Tracks 'Seam' Like Airbags

A Robot or a Science Instrument?

Dawn Orbiting Vesta

Phoenix Soaks up the Sun

Aquarius - SAC-D (Artist's Concept)

Second Test Rover Added for 'Free Spirit' Tests

Shooting Lasers

Beginning the Journey to the Launch Pad

President Obama Phones Mars Rover Team

Spark Generated by ChemCam Laser During Tests

New Galaxy Quest Readies for Launch

Mars Science Laboratory Mission's Curiosity Rover (Stereo)

Preparing Juno for Acoustical Testing

Three Generations of Rovers in Mars Yard

Location of DAN on Curiosity

Preparing for Solar and Thermal Testing of Curiosity Mars Rover

Curiosity Speaks Volumes

Mars Rover Curiosity in Artist's Concept, Wide

Mars Science Laboratory Rover Closeout

Artist's Concept of Gravity Recovery and Climate Experiment

Wrapping NuSTAR in Its Rocket Nose Cone

Juno Weighs In

NASA Mars Rover Curiosity at JPL, View from Front Left Corner

Phoenix Lander on Mars

Installing Electronics in Juno's Vault

Juno Taking Shape

Building the Moon Mineralogy Mapper