A 40-million-ton asteroid will pass extremely close to Earth twelve years from now and it could potentially slam into our planet years later.
If Apophis did strike Earth, it could create a crater about 1.25 miles across and almost 1,700 feet deep. Such an impact could be devastating, as on average an asteroid this size can be expected to impact Earth about every 80,000 years. It could annihilate a city if it were to directly land on an urban area. The blast would equal 880 million tons of TNT or 65,000 times the power of the atomic bomb dropped on Hiroshima.