Near-Earth asteroids have long been a concern ... meter object could unleash hundreds of millions of tons of dust into the ...

Martian soil and dust, known as regolith ... Oort Cloud is home to billions of icy asteroids, which, if smashed into Mars, could give the planet an atmosphere. Mars has a much thinner atmosphere ...

Asteroids the size of Bennu are believed ... the explosion of an asteroid impact would eject a vast column of dust into the atmosphere. If Bennu hit Earth, Dr Dai and his co-authors estimate ...