Earth is covered in water—but scientists still debate how it got here in the first place. This video explores the mysterious ...

But the very heart of our planet remains a mystery. For many years, scientists believed that iron and nickel made up Earth’s ...

Scientists trying to work out whether a star exploded and the resulting debris crashed into Earth 10 million years ago may be one step closer to solving the mystery. They discovered an unusual amount ...

Earth may owe some of its properties to a nearby star that blew up just as the solar system was forming. This pattern, which saw a supernova bubble envelop the sun and shower it with cosmic rays, may ...