UFOs or extraterrestrials, are they a figment of our imagination?Are they just human pranks or are intelligent aliens really trying to contact us.Find out how we search for life in the universe. Do we send probes out?What are the crop circles?
Can life exist on Mars or any other planet?The main candidates in the solar system that can harbour life are Mars,Europa and Titan.Get enlightened as you read about all of these at the bbc website.
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