An asteroid plummeting to Earth seems extremely unlikely, wonder several movies have used it as a plot. But asteroids, comets, and meteorites do fall to Earth every day. In recent years, ne have been of a significant eugh size to cause great damage. However, it is theorized that a space object was responsible for the extinction of disaurs 65 million years ago. Readers will explore whether or t such an event could threaten life on Earth again, learn how scientists monitor asteroids and other space objects, and learn some theoretical plans to avoid a global catastrophe.