RTG fit and test

A short film from 1969 showing Ranger 9 images as it approached the Moon.

Everyone likes to check the weather in a far away destination before they travel there. This is especially true for spaceflight, where the destination may be where no one has gone before.

Vesta and Ceres reside in the boundary area of the asteroid belt, where the composition of bodies changes from being almost dry to showing the effects of hydration.

The Dawn spacecraft visited the asteroid 4 Vesta for the time period May 3, 2011 to Sept. 5, 2012.

What can you see in the February sky? Stars and planets with distinct red and blue colors, like Mars and Sirius.

Cassini scientist Dr. Kevin Baines discusses Saturn's Cyclones.

This animation shows the last 30 seconds of Cassini's X- and S-band radio signals as they disappeared from mission control on Sept. 15, 2017.

As Titan Turns

The Cassini spacecraft arrived at Saturn in June 2004 and is now halfway through its mission. A new photo essay showcases some stunning images returned by the mission.

The moon Tethys is joined by two smaller moons in this movie from NASA's Cassini spacecraft.

Dark spokes dance around Saturn's B ring in this series of movies comprised of images taken with Cassini's wide-angle camera.

This video highlights Dawn's top accomplishments during its orbit around the giant asteroid Vesta.

Amateur video: Follow the Cassini spacecraft during its journey to and near Saturn.

This animated graphic shows how Saturn and its moon Enceladus are electrically linked.

This colorized movie from NASA's Cassini mission shows a polar projection of the curious six-sided jet stream at Saturn's north pole known as "the hexagon" in the infrared.

This movie, built with data collected during the European Space Agency's Huygens probe on Jan. 14, 2005, shows the operation of the Descent Imager/Spectral Radiometer camera during its descent and ...

What incredible things will the Cassini spacecraft at Saturn see and do over the next few years?

Glowing like a neon lasso, Saturn’s aurora is seen spinning above Saturn’s north pole over the course of most of a Saturn day in this movie made from multiple images taken by the ultraviolet imagin...

Clouds move above Titan's large methane lakes and seas near the moon's north pole in this movie made from images taken by NASA's Cassini spacecraft.

Trouble pronouncing Rosetta and Philae's target comet? We called in some expert help.

NASA's New Horizons spacecraft launched toward Pluto in 2006, but the mission can trace its start back to 1930, when Clyde Tombaugh discovered the small planet and opened the door to a new, mysteri...

This frame from a video from NASA's Dawn mission shows dwarf planet Ceres in false-color renderings, which highlight differences in surface materials.

This movie captured by NASA'S Cassini spacecraft shows a south polar vortex, or a swirling mass of gas around the pole in the atmosphere, at Saturn’s moon Titan.

See highlights from the scene at JPL on April 26-27, 2017, and some of the first raw images the spacecraft sent back from its closest-ever look at Saturn’s atmosphere.

MESSENGER captured this departure sequence of Venus after a close flyby of the planet in 2007.