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

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 ...

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 ...

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 ...