CGI Simulation of Asteroid Impact on Earth

(AustraliaMatters) What would happen if a large 500 km (300 mile) asteroid hit planet earth? — We’re not into so called Mayan December 2012 armageddon stories but at the same time we understand it’s a big universe out there and nothing should ever be ruled out, no matter how hard we try to ignore some things. This supposedly happened to earth six times before. I guess my message is, don’t take life for granted, and our so called leaders can’t control everything.