Pluto
See 5 Stunning Images of Pluto As Vast Ice Volcanoes Revealed in Photos
Relatively recent ice volcano activity on Pluto raises the possibility of liquid water beneath the freezing planet's surface.
Fans in Shock After Spying Mickey, Donald and Goofy in 'The Little Mermaid'
Blink and you'll miss the cameo from the beloved Disney characters, while even Kermit the Frog makes an appearance in the 1989 film.
Why Pluto Was Demoted From Being a Planet
The tiny, icy world, classified by scientists as a dwarf planet for 15 years, is even smaller than the moon.
Hygiea: Enormous Asteroid Is Actually a Tiny Dwarf Planet, Scientists Say
Scientists say the Iowa-sized object in the asteroid belt has a surface composition similar to Ceres.
Scientists May Have Solved One of the Mysteries of Pluto's Subsurface Ocean
The findings could have implications for our understanding of how subsurface oceans form on other worlds.
Scientists Ask Public to Help Name Minor Planet
The planet was discovered more than a decade ago in the outer reaches of the solar system.
NASA New Horizons Shows Distant Reaches Of Solar System
"This is the most distant exploration of any world in history," Alan Stern said. "We are the Lewis and Clark of our era."
Pluto Should Be Reclassified as a Planet: Scientists
In 2006, the International Astronomical Union voted to downgrade Pluto to the status of dwarf planet, sparking a highly controversial debate that has yet to truly subside.
Scientists Are Angry About 'Planet 9' Because of Pluto
Some researchers think that a hypothetical ninth planet exists in the furthest reaches of the Solar System.
Search for 'Planet X' Turns Up 12 More Jupiter Moons
Scott Sheppard's team is using a supercomputer to simulate 79 discovered moons of Jupiter over billions of years to learn how often Valetudo would collide with its neighbors.
Pluto Is Piled High With Dunes of Methane Sand
"We knew that every solar system body with an atmosphere and a solid rocky surface has dunes on it, but we didn't know what we'd find on Pluto."
50 of the Most Stunning Photos of Our Solar System
Some of the most stunning photos of the planets and moons in our solar system, including our own.
Pluto 'May Be a Giant Comet'
Scientists have a new theory, called the cosmochemical model of Pluto formation.
Roman 'gate to hell' was once site of deadly sacrifices
To the disbelief of spectators, all of the animals which entered into the gates perished, while miraculously, the priests emerged unscathed.
Ice Balls at Edge of Our Solar System Could Hide Oceans
The finding means we may need to add places like Pluto and Eris to our list of potentially habitable destinations.
Explore Mars, Venus, Europa and More From Earth
Want to get away? Far, far away? Google now has you covered.
Gigantic Ice Spikes on Pluto Trace Climate
They're not just fields of ice spikes as tall as skyscrapers—they can also tell us about Pluto's past.
After Cassini, NASA Plans More Life-Seeking Missions
Don't cry too much about Cassini. Upcoming missions are going to Mars, Mercury, the Sun, Europa and several asteroids.
New Horizons Will Brush by a Hunk of Space Ice
NASA is slowly releasing details about its visit to a Kuiper Belt Object four billion miles away.
Watch: Pluto as You've Never Seen It Before
The video shows Pluto's 2-mile high mountains and icy surface, as revealed in NASA's 2015 mission.
Pluto Seen as a 'Pretty Wild Place Geologically'
High-resolution photos from NASA's New Horizons spacecraft and other data show a complex, geologically active world.
Take a Simulated Tour of Dwarf Planet Ceres
NASA's Dawn spacecraft spent several weeks mapping Ceres from 900 miles up. Here's a simulated tour.
Evidence of New 'Planet Nine' Found in Solar System
The planet is believed to be 5,000 times the mass of Pluto.
The Eight Most Notable News Moments of 2015
2015 will perhaps be remembered as a year of cultural tipping points.
First Scientific Paper Published on Pluto Flyby Is Just the Beginning
Just three months after the historic flyby, the New Horizons team has a paper coming out in the journal "Science."
Blue Skies and Water Ice: New Discoveries on Pluto
Program scientist Curt Niebur explains new data from NASA's New Horizons mission.
New Pluto Photos Reveal a Closer Look at the Dwarf Planet's Landscape
NASA has released an image taken by the New Horizons spacecraft just 15 minutes after its Pluto flyby.
For Pluto 'Truthers,' the New Horizons Mission Is Only the Latest Lie
Continuing a long tradition of space program conspiracy theories, 'Pluto Truthers' claim NASA is faking it.
Inside the Pluto 'Truther' Movement
A group of people sees the New Horizons as just the latest phony space mission.