Astronomers watched a distant star dim for months and found a metal-rich cloud that may be the aftermath of a massive ...

Around the bright star Fomalhaut, astronomers spotted glowing clouds of debris left behind by colossal collisions between large space rocks. One of these clouds was even mistaken for a planet before ...

Astronomers just witnessed the aftermath of something rarely seen: a fresh dust cloud from a cosmic collision around a nearby star, and then another one appearing in nearly the same spot. Twenty years ...

The formation of Mercury remains an unsolved mystery. The planet closest to the Sun has a disproportionately large metallic core – accounting for about 70% of its mass – and a relatively small rocky ...

Discover the only planet in our solar system that rotates clockwise. Learn why this 'rebel' planet spins backwards, how a ...

Astronomers tracking a nearby star system thought they had spotted an exoplanet reflecting light from its star. Then it vanished. Even stranger, another bright object appeared nearby. After studying ...