Saturn

The distinctive shape may have been the natural result of head-on collisions between smaller moonlets.

Ganymede is bigger than the planet Mercury, and all three of the others outsize ex-planet Pluto, making their formation a huge mystery.

The idea behind Shapeshifter is that a handful of individual units would work together to create a variety of modular designs, each with a different skill.

Cyclones 2,500 miles wide gather at Jupiter's poles.

It's also the best time of the year to see Mercury.

The moon's unique atmosphere is part of the reason the Cassini mission had to come to such a bitter end.

Two new papers give us the best glimpse yet at Titan's surface.

Saturn's gravity is so fierce it can tear a moon apart to festoon itself with rings.

Shadows, wind and rain might explain weird radio signals from Saturn.

Saturn's Enceladus has become a prime search location for alien life as potentially habitable waters appear to flow beneath its icy crust.

The clouds triggered a four-year cold snap. Talk about “winter is coming.”

It'll be the last time to spot the gas giant in 2017.

Scientists suggest Enceladus’s porous core could keep its subsurface ocean liquid for billions of years.

The space agency compiled a compilation of some of the eeriest sounds from space, just in time for Halloween.

NASA leaks beautiful images from final Cassini mission.

Like all felines, the kittens in Saturn's rings are coy with their secrets.

As a triumphant mission to Saturn ends, its lead imaging scientist recalls her favorite photographs and moments.

Cassini will hurl itself into Saturn on September 15, but it has big questions to answer first.

The spacecraft is conducting a series of unprecedented final orbits before it burns up on September 15.

Cassini’s first dive in its grand finale revealed the space between rings is largely free of dust particles.

The spacecraft has already provided NASA with much new data. Now it is on its way through the rings of Saturn to the end of its mission.

NASA scientists announced today that Enceladus, the sixth-largest moon of Saturn, has hydrothermal vents that are actively releasing hydrogen. Because such ecosystems are known to support life, the discovery confirms that Enceladus is a habitable environment.

The discovery means Enceladus is one of our best hopes for extraterrestrial life.

Saturn's moon Enceladus is only 300 miles wide—it would fit between New York City and Charlottesville, Va.

Soldiers are caught in the crossfire as the battle lines shift to Central America

Why is China suddenly cozying up to its nemesis? Are they preparing for war?

Crunching numbers will finally let students and their parents get smart about picking a college

American consumers want to know if their food has been genetically altered, but the food industry says it knows what’s good for them

The answer to the last, great mystery about the massacre last year at Sandy Hook Elementary School has been in plain sight for years

He might be the best basketball player you’ve never heard of, but hoops isn’t why you need to hear Johnny Neumann’s story of weed, women, rebellion and homework