The Apollo missions changed how scientists understand the moon. Returning with Artemis could help solve some of the biggest lunar mysteries.

Earth’s distant future has always been framed as a slow fade billions of years from now, but a new generation of models is painting a sharper and more unsettling picture. Instead of a gentle decline, ...

The global water cycle describes the circulation of water—a vital and dynamic substance—in its liquid, solid, and vapor phases as it moves through the atmosphere, the land, and the rivers, lakes, and ...