Space agency unveils new Planetary Defense Coordination Office.
Bong Wie, the center's director, told Space.com that 99 percent of the pieces left would miss Earth, and most of the rest
"I wrote a book, I wrote a book. It's called 'The End of the Age' and it deals with an asteroid hitting the Earth," Robertson
During a question-and-answer session, a 9-year-old boy named Jacob got into a riveting exchange with famed astrophysicist