Contact with alien life is just around the corner, according to leading physicist, but we shouldn't expect it to be friendly.

String theory expert and futurist Michio Kaku believes we'll find signs of life in the universe within the century.

But just blindly reaching out to extraterrestrials is 'a terrible idea,' he told The Guardian, comparing it to Montezuma meeting with Hernan Cortés before the Spanish decimated the Aztec in the 16th century.

Kaku, the author of several science best-sellers, advises making first contact 'very carefully.'  

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