How Phoenix Measures Wind Speed and Direction

NuSTAR Inches Toward its Rocket

An Astronomer's Fantasy: Planets in the Lab

GRAIL Spacecraft Over the Moon

Engineers Test Roll-Off at JPL

Curiosity Inside Aeroshell, Artist's Concept

Watching Test Drives in California for Rover Mission to Mars

Checking Tilt of Lightweight Test Rover

Preparing Juno for Environmental Testing

Artist’s Concept of the Orbiting Carbon Observatory

Liftoff of the Delta II Rocket

Simulating Titan-Like Smog

Schematic Animation of Phoenix's Microscope Station

Sensor head on the Mars-bound APXS Instrument

Mars Rover Curiosity in Artist's Concept, Wide

Artist’s Concept of the Orbiting Carbon Observatory

Artist's concept of Mars Reconnaissance Orbiter

Installing Electronics in Juno's Vault

Three Generations in Mars Yard, High Viewpoint

Relative Positions of Distant Spacecraft

Mars Science Laboratory and Its Payload Fairing

Rendezvous in Martian Orbit (Artist's Concept)

The Five Most Abundant Gases in the Martian Atmosphere

Mars Sample Return Spacecraft Before Arrival (Artist's Concept)

Working on Curiosity in JPL Spacecraft Assembly Facility

Radiation Assessment Detector for Mars Science Laboratory

Juno Gets Ready to Shake It

The Universe, Summed Up in a Squiggly Line

Artist's Concept of Mars Exploration Rover

President Obama Phones Mars Rover Team

NASA's Next Mars Rover on a Test Drive

Artist's Concept of Next Generation Space Telescope

Inspecting a Canister and Sample Collector

Turning in the Testbed

Parachuting to Mars

Weighing Molecules on Mars

Moving Juno to Environmental Testing

Inspecting Juno's Radiation Vault

Artist's Concept of the Orbiting Carbon Observatory

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

Euclid in Space

Weather Sensors from Spain on Mars Rover Curiosity

NASA's Juno Spacecraft Taking Shape in Denver

NASA's WISE Cryostat

Preparing for Next Test

Full-Scale Image of MAHLI Calibration Target

Voyager 1 Encounters Stagnation Region

Radiation Levels on the Way to Mars

3-D Anaglyph Fish-eye View of NASA's Curiosity Rover and its Rocket-Powered Descent Vehicle

Spark Generated by ChemCam Laser During Tests

Mars Interior (Artist Concept)