Working on Curiosity in JPL Spacecraft Assembly Facility

Simulating a Submarine Hydrothermal Vent

Setting up Juno's Radiation Vault

President Obama Phones Mars Rover Team

Deep Space 1's Ion Engine

Readying Juno's Propulsion Module

Liftoff of the Delta II Rocket

Kepler-22b -- Comfortably Circling within the Habitable Zone

Beginning the Journey to the Launch Pad

ChemCam Mast Unit Being Prepared for Laser Firing

Curiosity at Work on Mars (Artist's Concept)

Test Scooping for Mars Rover Curiosity

NASA's Juno Spacecraft Awaits Launch

New Galaxy Quest Readies for Launch

Model of Voyager

Preparing Mars Science Laboratory Heat Shield

Daytime Water Cycle on the Moon

Mars Reconnaissance Orbiter over Nilosyrtis

NuSTAR Orbits Earth (Artist Concept)

Inspecting Juno's Radiation Vault

Self-Portrait of Curiosity's 'Stunt Double'

NASA Tests Future Mars Landing Technology

InSight, a Mars MIssion (Artist Concept)

Mars Rover Curiosity in Artist's Concept, Wide

Wheel Installation

Artist's Concept of Mars Exploration Rover

Studying a Wider Swath

JPL Testbed Image of Airbag Retraction

Juno Gets a Taste of Space

Schematic of Laser-Induced Breakdown Spectroscopy

An Astronomer's Fantasy: Planets in the Lab

JPL Testbed Image of Deflated Airbag

NASA's Next Mars Rover on a Test Drive

Webb Instrument Undergoes Alignment Testing

Out-of-this-World Records

Final Checks of Aquarius Instrument

Testing the Capture Magnet

Radiation Levels on the Way to Mars

Top of Mars Rover Curiosity's Remote Sensing Mast

NEOCam Sensor

Curiosity Approaching Mars, Artist's Concept

Artist's Concept of Gravity Recovery and Climate Experiment

Juno Weighs In

Mars Interior (Artist Concept)

Full-Scale Image of MAHLI Calibration Target

Moving Juno to Environmental Testing

Mars Science Laboratory and Its Payload Fairing

Diviner Following Integration to the Lunar Reconnaissance Orbiter (LRO)

Three Generations of Rovers with Standing Engineers

Laying the Groundwork for Curiosity's DAN

Juno Taking Shape