Science has progressed from wild speculation about Earth’s planetary neighbors—including how they formed and whether they are inhabited—to a better understanding of our celestial neighborhood Editor’s ...

Astronomers have discovered a rare in-sync solar system with six planets moving like a grand cosmic orchestra, untouched by outside forces since their birth billions of years ago. The find, announced ...

The Ancient Maya may have had large libraries and an advanced writing system, but very little remains today. Indeed, only four texts are known to have survived, the oldest (and best preserved) of ...