Earth's Moon, a constant companion for billions of years, profoundly shapes our planet. It drives ocean tides, stabilizes ...

A 2015 astronaut photo shows dark-orange water that appears to bleed across the bright-white floor of a high-altitude salt ...

Four-and-a-half billion years ago, a massive world—possibly as big as the moon or even Mars—orbited our sun before crashing ...

A new study presents a compelling new model for the formation of super-Earths and mini-Neptunes -- planets that are 1 to 4 times the size of Earth and among the most common in our galaxy. Using ...

Even when Earth was locked in its most extreme deep freeze, the planet’s climate may not have been as silent and still as once believed. New research from ancient Scottish rocks reveals that during ...

Earth's core contains up to 45 times more hydrogen than the oceans do, making it the largest hydrogen reservoir on the planet, a new study suggests. Researchers found that this vast amount of hydrogen ...

The Earth-size planet HD 137010 b has a ‘50% chance of residing in the habitable zone’ of its sun-like star, scientists say Astronomers have discovered a potentially habitable new planet about 146 ...

On ‘Star Wars day’, researchers more than double the number of potential known ‘circumbinary’ planets like the fictional Tatooine, home to Luke Skywalker ...

Somewhere between the scorching extremes of hot Jupiters and the frozen depths of gas giants like Saturn lies a planet that ...