Pictures: Do Aliens Exist? If So, Will They Kill Us? : Discovery News

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In Stephen Hawking's documentary, he discusses the possibility of alerting the wrong kind of alien life to our location in the cosmos. What if first contact is made with an aggressive alien race with technologies far superior to our own? In this scene from "Into the Universe with Stephen Hawking" an alien civilization harnesses the total energy output of a star to create a wormhole. This wormhole is consequently used to transport an invasion fleet to Earth -- a scenario we are not prepared for.

For more scenes from this groundbreaking new documentary, see the Discovery Channel's gallery: Stephen Hawking's Aliens.

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As the invasion fleet approaches Earth, what will happen next? Will the advanced alien species even care that our planet is inhabited? Will they just plunder Earth of its natural resources and move on? Would we be prepared, or even able to repel such an onslaught? Find out more in the Discovery News article "Do Aliens Exist? If So, Will They Kill Us?"