ALIENS could be among us - but we just cannot recognise them, Britain's top astronomer has said.

Lord Martin Rees said the visitors might be in a form beyond human understanding. Lord Rees, president of the Royal Society academy of science and also astronomer to the Queen, said: "They could be staring us in the face and we just don't recognise them."

The respected professor went on: "The problem is that we're looking for something very much like us, assuming that they at least have something like the same mathematics and technology.

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