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Ufos at the sky --- Image by © Sagel & Kranefeld/Corbis
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Invasion --- Image by © 68/Colin Anderson/Ocean/Corbis
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23 Aug 2002 --- Green Alien Face --- Image by © Envision/Corbis
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Extraterrestrial in the Mist --- Image by © Mike Agliolo/Corbis
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Extraterrestrial --- Image by © Mike Agliolo/Corbis
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Boy Wearing Alien Mask --- Image by © Rainer Holz/Corbis
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Pacific Islander woman wearing futuristic combat gear --- Image by © Colin Anderson/Blend Images/Corbis
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06 Dec 2009 --- A thin veil of gaseous material surrounding the blue-white star Vega is seen here as a hazy sunrise on a small moonlet in orbit around the cloudy planet. Vega itself is still below the horizon. --- Image by © Stocktrek Images/Corbis
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August 24, 2010 --- Alien, computer artwork. --- Image by © VICTOR HABBICK VISIONS/Science Photo Library/Corbis
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A man out in the foggy wilderness is being abducted by a U.F.O. with a bright beam of light. --- Image by © C.J. Burton/Corbis
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20th century --- Magazine Cover with Robot War Machines by Blade Gallentine --- Image by © Forrest J. Ackerman Collection/CORBIS
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1985 --- Montage of Science Fiction Scenes with Portrait of Illustrator Frank R. Paul by Anton Brzezinski --- Image by © Forrest J. Ackerman Collection/CORBIS
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1985 --- Painting of Science Fiction City Battle by Anton Brzezinski --- Image by © Forrest J. Ackerman Collection/CORBIS
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Ufos above the city --- Image by © Claudius/Corbis
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Alien --- Image by © Gregor Schuster/Corbis
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Man in Alien Costume --- Image by © Rainer Holz/Corbis
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Space Alien --- Image by © Mike Agliolo/Corbis
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Nevada, USA --- Aluminum alien statue near Extra Terrestrial Highway in Nevada --- Image by © Momatiuk - Eastcott/Corbis
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Alien making contact --- Image by © Colin Anderson/Blend Images/Corbis
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Red robot attacking with beams from eyes --- Image by © Ikon Images/Corbis
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Inflatable alien with Welcome to Roswell sign in background --- Image by © Vstock LLC/Tetra Images/Corbis
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Alien abduction. Alien beings examine a human woman on their spaceship. posed by models 1998 --- Image by © David Levenson/Corbis
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15 Nov 2012 --- A pair of P-51 Mustang Fighter planes blowing up a crashed alien vehicle and it's robotic crew member, during Earth's ongoing secret war with this robotic enemy race. --- Image by © Mark Stevenson/Stocktrek Images/Corbis
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20th century --- Painting of a Science Fiction Scene with Robots and Spacemen by Anton Brzezinski --- Image by © Forrest J. Ackerman Collection/CORBIS
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Alien --- Image by © Randy Faris/CORBIS