Doomsday Meteor

A meteor bigger than the moon, and unseen by Earth until now, has less than a week until planetary impact. Scientists try to stop the giant mass with rockets armed with high-powered lasers. When that fails they land on the asteroid, mounting it with rockets in an attempt to push its orbit away from Earth. But as the team continues to run into problems they never imagined, the future of Mankind becomes more and more bleak.