For a long time, Earth’s ending seemed settled. In about five billion years, the sun will swell into a giant, the inner Solar ...

Billions of years ago, while the solar system was still young, a massive object may have drifted into it. It's not a spaceship, but it is an alien visitor in its own right—a colossal interstellar ...

The study, published in Science Advances, focuses on two elements that are essential for life as we know it: nitrogen and phosphorus.