IMAGE: A new study by CU-Boulder researchers indicates a thick organic haze shrouding Earth several billion years ago was similar to the one now hovering over Saturn’s largest moon, Titan. University ...

Four billion years ago, our then stripling sun radiated only 70 to 75 percent as much energy as it does today. Other things on Earth being equal, with so little energy reaching the planet’s surface, ...

The first life-forms on Earth drew energy from sunlight filtering down into the ocean depths. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. By ...

A new study by CU-Boulder researchers indicates a thick organic haze shrouding Earth several billion years ago was similar to the one now hovering over Saturn’s largest moon, Titan (above) and may ...

Earth may have gobbled up a Mercury-like body early in our planet’s history, and that may have helped create a heat source in our iron core—an energy source that would go on to generate the planet’s ...

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Researchers say ...

Water has made the Earth the planet that it is—a planet known for its blue oceans. Water shapes the land through erosion and is fundamental to Earth’s ability to support life. But we have a hard time ...

Geologists from the University of Hong Kong (HKU) have made a breakthrough in understanding how Earth's early continents formed during the Archean time, more than 2.5 billion years ago. Their findings ...

Earth's earliest continents may have set the chemical stage for life by regulating boron levels in ancient oceans, a new ...

"Molecular time travelers" are one piece of the puzzle to understand whether there's life beyond Earth. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...