Mars Rover Curiosity, Turning in Place

Testing Precision of Movement of Curiosity's Robotic Arm

Three Eclipsing Bodies (Artist Concept)

Readying Juno's Propulsion Module

Prepping WISE to Pop its Lens Cap

Aquarius Lifts Off!

Protecting Juno's Electronics from Radiation

Size of Kepler Planet Candidates

Testing Sequences of Wheel Turns

Weather Sensors from Spain on Mars Rover Curiosity

A Dance of Two Suns and One Planet (Artist Concept)

Rehearsal: Sample Canister in Cleanroom (Animation)

Three Generations of Rovers with Crouching Engineers

Interferometer Testbed

Moving Juno to Environmental Testing

Testing of Icy-Soil Sample Delivery in Simulated Martian Conditions (Animation)

Example of a Spectrum from Curiosity's ChemCam Instrument

Bird's Eye View of Kepler-16 System (Artist Concept)

How Phoenix Gets a Look at its Footing

Animation of Phoenix's Wrist Unlatching

Planck Spacecraft (Artist Concept)

Flight Testing the Landing Radar for Mars Science Laboratory

Curiosity's Robotic Arm Bent at Nearly a 90-degree Angle

Daytime Water Cycle on the Moon

Deep Space 1's Ion Engine

Phoenix Without its Parachute

Test Rover Aids Preparations in California for Curiosity Rover on Mars

WISE Arrives at Vandenberg Air Force Base

Bright Days Ahead for Curiosity Mars Rover

Rotating Curiosity's Back Shell Powered Descent Vehicle

Close-up of Diviner Solar Calibration Target

Test Model of Mars Landing Radar

Low-Energy Charged Particle Instrument Assembly

Shooting Lasers

NASA's WISE Spacecraft in Protective Covering

JPL Testbed Image of Airbag Retraction

Installing Juno's Radiation Vault

Juno Marches On

Martian Samples Leaving Mars (Artist's Concept)

Biggest-Ever Heat Shield Prepared for Mars Spacecraft

Airborne Testing for Mars Landing Radar by Dryden F/A-18

Juno Mission to Jupiter (2010 Artist's Concept)

NuSTAR's Russian Doll-like Mirrors

Final Steps in Mating NuSTAR to its Rocket

Chemistry and Mineralogy Instrument Installed in Mars Rover

Aquarius - SAC-D Spacecraft is Prepped for Shipping

Mars Science Laboratory Aeroshell with Curiosity Inside

Mars Science Laboratory's Cruise Stage in Test Chamber

Probing Brown Dwarf Layers

Engineers Flex Curiosity's Robotic Arm and Tools

Three Generations in Mars Yard, High Viewpoint