"We don’t know where they are,” said NASA’s planetary defense officer Kelly Fast at the AAAS conference in Arizona this week.

A NASA planetary defense officer warns thousands of near-Earth asteroids capable of destroying a city remain undetected.

On hearing the words "city killer" and "asteroid" in the same sentence, you'd be forgiven for thinking something bad is about to happen. But not to fear. Although an asteroid with the potential to ...

NASA is tracking a near-Earth asteroid called 2026 BJ8 that is moving through space at around 50,000 kmph and is roughly the size of an airplane. Although its speed and relatively close approach to ...

Late in 2024, astronomers spotted a new near-Earth asteroid named 2024 YR4. By mid-2025, its improved orbit tracking raised an unusual possibility: the space rock could hit the Moon on Dec.

When astronomers talk about asteroid Apophis, the mood is a mix of fascination and unease. Discovered in 2004 and quickly ...

Asteroid systems, particularly binary configurations, represent dynamic natural laboratories for studying impact processes and collisional outcomes in our Solar System. Recent advances have shed light ...

Add Yahoo as a preferred source to see more of our stories on Google. This illustration shows the creation of an asteroid family. Ejected fragments from catastrophic collisions of asteroids between ...