Earth, our home planet, is a world unlike any other. The third planet from the sun, Earth is the only place in the known universe confirmed to host life. With a radius of 3,959 miles, Earth is the ...

A collection of down-to-Earth facts about our planet and its place ... These clips are from the BBC series, Primary Focus Science and Science Clips, Earth, Sun and Moon. Our main source of natural ...

Even if you weren’t someone who got excited about science class in school, now—as an adult—it’s hard not to be amazed by ...

Precambrian time covers the vast bulk of the Earth's history, starting with the planet's creation about 4.5 billion years ago and ending with the emergence of complex, multicelled life-forms ...