For more than a century, people have wondered whether our solar system's planetary count really stops at eight. The idea ...

For centuries, astronomers have sought to understand the formation and evolution of the solar system and the dynamics that govern it. In particular, there is the long-standing question of whether or ...

At the right point of the orbit and stellar cycle, the star’s chromosphere brightens.

A comet born around a distant star is now tearing through our solar system at roughly 150,000 miles per hour, and astronomers ...

Scientists may have discovered a dwarf planet far beyond Neptune — an unearthing that may disprove a longstanding theory about the possibility of a giant ninth planet. The dwarf planet's existence ...

Learn about the formation of the grains within many meteorites, emerging from collisions of planetary bodies in the early ...

While life on Mars (and Venus) has long been an obsession for those wondering if we're alone, there are other places in our ...