Discover how star collisions, tornados, micrometeoroids, and comets are drawing the attention of scientists eager to defend Earth from cosmic threats, in these four thought-provoking installments of the History Channel series "The Universe." Includes the episodes "Cosmic Collisions," "Wildest Weather in the Cosmos," "Deep Space Disasters," and "Deadly Comets and Meteors." 188 min. total. Standard; Soundtrack: English Dolby Digital 5.1.