As much as 45 oceans’ worth of hydrogen may be in Earth’s core, scientists reported, suggesting most of Earth’s water was ...

A new study analyzes three asteroid and two meteorite samples to see if space rocks smacking into Earth could’ve helped kickstart life.

Space technology on Earth has gone from futuristic to foundational in our everyday lives. From satellite innovations that enable global communication to space science applications improving ...

How did life begin on Earth? While scientists have theories, they don't yet fully understand the precise chemical steps that led to biology, or when the first primitive life forms appeared. But what ...

The last common ancestor of all living things did not just suddenly appear on Earth roughly 4.2 billion years ago. Some of its genes came from an even older and more mysterious source… "While the last ...

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

April brings us Citizen Science Month and Earth Day—that means it’s the perfect time to get outside, explore nature, and even help real scientists with their research! You don’t need to be an expert, ...

Earth was not always the blue-green world we know today: early Earth's oxygen levels were about a million times lower than we now experience. There were no forests and no animals. For ancient ...