The Asteroid Threat is Out There
‘Friday the 13th of April 2029 could be a very unlucky day for planet Earth. At 4:36 a.m. Greenwich Mean Time, a 25-million-ton, 820-foot-wide asteroid called 99942 Apophis will slice across the orbit of the moon and barrel toward Earth at more than 28,000 mph. The huge pockmarked rock, two-thirds the size of Devils Tower in Wyoming, will pack the energy of 65,000 Hiroshima bombs — enough to wipe out a small country or kick up an 800-foot tsunami.
On this day, however, Apophis is not expected to live up to its namesake, the ancient Egyptian god of darkness and destruction. Scientists are 99.7 percent certain it will pass at a distance of 18,800 to 20,800 miles. [..] We will have dodged a cosmic bullet.
Followup to Space rock on a collision course.