NASA Scientist Claims Earth May Have Been Visited by Extraterrestrials

Video: Strange object found in the Baltic Sea

A NASA scientist has claimed that Earth may have been once visited—or is being visited—by extraterrestrials, but we may not have realized it.

Silvano P. Colombano, who works at NASA Ames Research Center and is also a professor, theorizes that intelligent life may not be carbon-based or what we’re used to.