A quartet of particularly hefty asteroids ... making it the largest of the four, will reach a minimum distance of 2.8 million ...

YR4 has a 2.3% chance of hitting Earth in the year 2032. But according to new estimates, it may have an even smaller chance of hitting the moon instead.

Planet killer asteroids are space rocks that are 1 kilometer across or larger and could have a devastating effect on life. But smaller asteroids can cause regional devastation if they are ...

While NASA has made progress in tracking the largest asteroids, “There is still some chance that large comets from the outer solar system could appear and impact the Earth with warning times as ...

While most of the debris Earth encounters burns up harmlessly in the atmosphere, NASA is most concerned about the largest asteroids, some of which are miles wide.Dr. Joshua Colwell, a planetary ...

Bennu, one of the largest asteroids, has been the subject of research and simulations in the event of an impact with our planet. Bennu is 500 meters wide and astronomers have predicted a one in ...