Space

K2-18b orbits a red-dwarf star in the constellation Leo, and it's situated in the perfect zone to have liquid surface water.

Imagine trying to start a car that's been sitting in a garage for decades—and the car is 13 billion miles away.

Let's try to wrap our heads around it.

Even Carl Sagan, who created it, was turned down by NASA when he asked for one.

The cigar-shaped asteroid is 10 times longer than it is wide and was probably flung from a young stellar system, location unknown.

A composite image of Uranus by Voyager 2 and two different observations made by the Hubble Space Telescope

FYI, this ice giant is not pronounced "your anus," but rather, "urine us" … which is hardly an improvement.

Introducing Ross 128 b.

An artist's conception of the dwarf planet Ceres in the main asteroid belt.

The asteroid belt tells the story of the creation of the solar system.

"We have been waiting for this day for decades."

Plasma waves, stardust showers, and Jupiter lightning would sound right at home in a haunted house.

And you know what that means: Aliens!! (Kind of.)

It took a full year’s worth of satellite data to make it.

Interplanetary fame, here you come!

Did you know the famous astronomer campaigned for marijuana legalization? Read on for more little-known tidbits about Carl Sagan.

Cassini captured this sublime image of Saturn four days before it plunged into the planet's atmosphere.

You probably saw the headlines. Here's the inside look—and the big picture.

They're not explosions, they're "rapid unscheduled disassemblies."

Lucky stargazers in America have gotten the chance to see them from their own backyards lately—and may be able to again this week.

This portrait looking down on Saturn and its rings was created from images obtained by NASA's Cassini spacecraft on October 10, 2013.

On September 15, scientists will intentionally crash the Cassini spacecraft into Saturn. Mental Floss will be there in mission control as it happens. Here are some essential facts about Saturn to get you ready for the big event.

The 2017 solar eclipse was notable because of the wide swath of U.S. territory that got to witness totality. The rare event will happen again—but not for a while.