Earth is fortunate in having a magnetic field: it protects the planet and its life from harmful cosmic radiation. Other planets in our solar system—such as Mars—are constantly bombarded by charged ...

Some 4.6 billion years ago, Earth was nothing like the gentle blue planet we know today. Frequent and violent celestial impacts churned its surface and interior into a seething ocean of magma—an ...

Earth's atmosphere might have contributed to the origin of life more than previously thought. In a study published in the Proceedings of the National Academy of Sciences, CU Boulder researchers and ...