Aliens may have visited us already but we missed it’

A Nasa scientist says Earth may have already been visited by extraterrestrials — but that humans may not have noticed.

In a research paper,

P Colombano, a computer scientist at Nasa Ames Research Centre and a professor, suggests that aliens may look vastly different than the expectations that humans have of them — such as being carbon-based organisms — which would allow them to remain undetected.

“I want to point out the fact that the intelligence we might find and that might choose to find us (if it hasn’t already) might not be at all produced by carbon-based organisms like us,” Colombano wrote in the paper.