Earth is our home planet, and it's the only place in the universe where we know for certain that life exists. Earth formed over 4.5 billion years ago from a swirling cloud of gas and dust squished ...

Sound as we know it does not exist in space. That’s because, on Earth, sound mainly travels to our ears via vibrating air molecules. Because space is a vacuum, meaning there is no matter at all ...

With a radius of 3,959 miles, Earth is the fifth largest planet in our solar system, and it's the only one known for sure to have liquid water on its surface. Earth is also unique in terms of ...

Elephants are the largest land animals on Earth, and they're also one of the ... and they keep growing for an elephant's entire life. Just like humans are right- or left-handed, elephants tend ...

The majority of Earth’s land (68%) is located in the North. The hemisphere also has much more favorable climates and urban development for human civilization compared to the South. read more ...

I tried to hide my surprise. For months I'd been on the trail of the greatest natural disaster in Earth's history. About 250 million years ago, at the end of the Permian period, something killed ...