Add Yahoo as a preferred source to see more of our stories on Google. Nasa said that around 15,000 mid-sized asteroids are unaccounted for - Maciej Frolow Astronomers do not know where thousands of ...
Hosted on MSN
Thousands of 'city killer' asteroids could hit Earth, NASA's planetary defense officer reveals
NASA experts are raising alarms about the growing threat posed bynear-Earth asteroids, with some of these objects having the potential to cause devastating damage to cities. While some large asteroids ...
On February 15, 2013, the people of Chelyabinsk, Russia, witnessed something terrifying. A six-story-tall asteroid weighing nearly 10,000 metric tons tore through the atmosphere at more than 64,000 km ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results