A newly discovered dwarf planet could hold the key to unlocking the mysteries of our solar system’s outer reaches — but what ...

An alien comet passing through our solar system made its closest approach to Mars recently, and two European robotic ...

Astronomers are watching a new comet pass through our solar system with great interest. Based on its glow, the 33-billion-ton ...

"The detection of heavy water … proves the water's ancient heritage and provides a missing link between clouds, disks, comets ...

A new study led by UNLV scientists sheds light on how planets, including Earth, formed in our galaxy—and why the life and ...

Is interstellar object 3I/ATLAS an alien probe or a natural comet? Explore the compelling scientific evidence, from its tail to its chemical makeup, that debunks the myths.

Eight planets travel in circular paths around a burning ball of gases, called the Sun. Welcome to our Solar System, our space ...