NASA warning over 'city killer' asteroids which 'keep space chiefs up at night'
- Posted on February 17, 2026
- By The Mirror
- 6 Views
NASA warning over 'city killer' asteroids which 'keep space chiefs up at night'
Around 15,000 mid-sized asteroids, known as 'city-killers', are unaccounted for as they zoom around space close to planet Earth - with the potential to cause devastating damage
