Learn more about NASA's New Horizons mission, which performed history's first flyby of the Pluto system on July 14, 2015.
The water sloshing in Earth's oceans and coursing through its canyons may have been with the planet since it first started taking shape, new research suggests.
Scientists have spent 12 years arguing over how to classify Pluto, and a recently published paper offers a new — but surprisingly old — reason for restoring the object's planetary status.
See amazing images of the night sky and cosmos in Space.com's gallery of cosmic images posted in July 2018.
See amazing images of the night sky and cosmos in Space.com's gallery of cosmic images posted in June 2018.
See amazing images of the night sky and cosmos in Space.com's gallery of cosmic images posted in May 2018.
Meteorites may hold new clues about the supernova explosions from which the stars and planets of our solar system formed, new research shows.
In its first hundred million years, Mars could have started off close to Venus, before gravitational interactions moved it out to its present position.
With books about space and science intended for a young audience, there is a fine line between writing that's too complex and writing that older kids might write off as "babyish."
New images from the Hubble Space Telescope show Saturn's ultraviolet auroras swirling at the planet's north pole in the months before and after the northern summer solstice.
The New Horizons spacecraft is on its way to a distant solar system object and has spotted its destination — on its first try and from more than 100 million miles (170 million kilometers) away.
New research suggests why Jupiter, the largest planet in the solar system, waited about two million years for its early-formation growth spurt.
An awe-inspiring photo provides a breathtaking new view of Saturn's icy rings, showing that the iconic features are translucent.
"Ask a Spaceman" is live for the first time on Facebook — and astrophysicist Paul Sutter jumps right into it with a trip to Pluto.
Water and liquid rubies may exist within the nightside clouds of distant Jupiter-like exoplanets, but they melt in the heat of the planets' scorchingly hot bright sides, according to NASA.
There's a vast "hydrogen wall" at the edge of our solar system, and NASA scientists think their New Horizons spacecraft can see it.