Pluto is no longer a planet. The world’s top group of astronomers, the International Astronomical Union, has stripped Pluto of the status it has held since its discovery 76 years ago. The body decided ...

The simulation of the Solar System that came the closest to the observation was the presence of a small planet, between the ...

Pluto's equator is partially covered in ridge-like ice spires known as "bladed terrain." A new study suggests that there are more of these skyscraper-size structures than previously thought. (Image ...

When NASA released images of Pluto in 2015 taken by the New Horizons spacecraft, many were captivated by the dwarf planet’s heart-shaped feature, now called Tombaugh Regio. And now the mystery of how ...

The Hubble Space Telescope may be getting old, but it still has excellent spotting power — witness its discovery of a fourth moon of Pluto, which is between 8 miles and 21 miles in diameter. Says ...

Kiladze Caldera, formerly called Kiladze crater, may be a supervolcano that erupted fairly recently, spewing ice across the surface of Pluto. When you purchase through links on our site, we may earn ...

The space probe began making discoveries even before today's flyby. — -- Three billion miles and nearly ten years of travel led up to the moment NASA's New Horizons probe zoomed past Pluto today, ...

PASADENA, Calif.–To paraphrase a certain young lady from literature, the tenth planet Xena is getting curiouser and curiouser. Data released today by the Space Telescope Science Institute reveals that ...