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Making contact with ET? Aliens may already know we're here

Earth is dotted with humongous, human-made structures that, to an alien eye, may be tell-tale signs of intelligent goings-on.

The mysterious sound in space: What China’s first astronaut heard during Shenzhou 5

As the first Chinese astronaut ever sent into space in 2003, Yang Liwei made history with his ride on Shenzhou 5. However, ...