London, April 22 : There is extraterrestrial life and it is being concealed by the United States government, claims ex-NASA astronaut Edgar Mitchell.itchell made the claims at the fifth annual X-Conference - a meeting of those who believe in UFOs and other life forms.

Mitchell, who was part of the 1971 Apollo 14 moon mission, said that alien life does exist but the truth is being covered up by the U.S. govt.

The 78-year-old also said that he had tried investigating the 1947 'Roswell Incident', which some believe was the crash-landing of a UFO, but had been thwarted by military authorities.We're not alone. Our destiny, in my opinion, and we might as well get started with it, is [to] become a part of the planetary community. ... We should be ready to reach out beyond our planet and beyond our solar system to find out what is really going on out there," the Telegraph quoted Mitchell as saying.

"I urge those who are doubtful: Read the books, read the lore, start to understand what has really been going on. Because there really is no doubt we are being visited. The universe that we live in is much more wondrous, exciting, complex and far-reaching than we were ever able to know up to this point in time," Mitchell added.

A rep for NASA told CNN: "NASA does not track UFOs. NASA is not involved in any sort of cover-up about alien life on this planet or anywhere else - period."