Meteor

Description for METEOR by Edmund H North and Franklin Coen from the screenplay by Stanley Mann and Edmund H North:

A comet, millions of miles long from its flaming nucleus to the end of its fiery tail, blazes across the vastness of outer space - and slams into the asteroid belt. A meteor, a giant chunk of the asteroid Orpheus, is ripped loose and flung toward a small, blue planet. Earth - Can the imperiled inhabitants of the planet find a way to divert the missile of destruction? They have just 6 days to try...