This model reveals how vastly different the atmosphere was on ancient Earth, and how life may have first emerged. The key to unlocking the secrets of distant planets starts right here on Earth.

A recent paper suggests that if astrobiologists want to make an educated guess about what life on Venus might look like, they should look to a weird microbe called A. ferrooxidans, found here onEarth.

Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. In the 1931 movie ...

Alien life might look unlike anything we've ever seen on Earth. Trying to find evidence of these unknown organisms will require some creativity. When you purchase through links on our site, we may ...

Emerging evidence suggests that plate tectonics, or the recycling of Earth's crust, may have begun much earlier than previously thought — and may be a big reason that our planet harbors life. Earth's ...