Taliban Frees American Academic Held More Than Year
By LUKE FUNK
|National
A NASA image of an asteroid similar to YR4. NASA/Goddard/University of Arizona/CSA/York/MDA via AP
NASA Boosts Odds of Massive ‘Killer’ Asteroid Striking Earth
If it hits, the explosion would be 500 times as powerful as the atomic bomb dropped on Hiroshima and have a blast radius of more than 30 miles.
