Two American astronomers attempt to warn humankind about an approaching comet that will wipe out life on planet Earth. Two American astronomers attempt to warn humankind about an approaching comet that will wipe out life on planet Earth. Two American astronomers attempt to warn humankind about an approaching comet that will wipe out life on planet Earth. Two American astronomers attempt to warn humankind about an approaching comet that will wipe out life on planet Earth.
