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Scientists have long debated the reasons behind the mass extinction of the dinosaurs, frequently citing the possibility of an asteroid slamming into the Earth. The likelihood of such an event is the subject of Practical Guide to the Universe: Asteroid!, as host Tom Selleck offers information regarding these objects that can reach gigantic proportions. The unknown disaster destroyed almost all life on Earth at the time of its occurrence. If an asteroid was the culprit, could it happen again? Viewers will see how asteroids appear throughout the solar system, and could well collide with the planet.