Astronomers do not know where thousands of “city-killer” asteroids are, Nasa’s head of planetary defence has admitted.

NASA's head of planetary defence has revealed what keeps her up at night - tens of thousands of 'city killer' asteroids that remain undetected.

A top astronomer responsible for defending the Earth against asteroids has revealed what keeps her up at night — thousands of “city killer” space rocks that remain undetected. Dr Kelly Fast, NASA’s ...

Crossing Planetary Boundaries (PB)—a concept that defines nine potential ecological “tipping points”—could spell doom for ...

The fourth planet in the system is a rocky world, while the second and third ones are gas planets.

Astronomers have observed a planetary system that challenges current planet formation theories, with a rocky planet that ...

An international team of astronomers has discovered a distant planetary system that challenges long-standing theories of how planets form.

Astronomers have uncovered a distant planetary system that flips a long-standing rule of planet formation on its head. Around the small red dwarf star LHS 1903, scientists expected to find rocky ...

Since the 1990s, astronomers have found a handful of other dwarf planets in the belt, such as Eris and Sedna, along with ...

Scientists around the world have been scrambling to fill in gaps and make space on their servers for American data sets, ...

A dazzling new Hubble image peels back the layers of the mysterious Egg Nebula, a rare and fleeting phase in a Sun-like star’s death just 1,000 light-years away. Hidden inside a dense cocoon of dust, ...