Former NASA astronaut Edgar Mitchell, who once walked on the moon, says that he believes that aliens did crash in Roswell, and some of them were captured alive.

"The truth about it is that it was real. I was there when the Roswell incident took place. I was on my way to college and had just graduated high school. One day, it was in the Roswell Daily Record, which was a newspaper in Roswell, about an alien spacecraft that had crashed, and the next day that it had been denied by the Air Force, saying that it was a weather balloon. I believed that and went off to college," Mitchell says.

"Many years later, after I had been to the moon and came back, I went out to Roswell to give lectures, talk and meet people I knew since I was a kid. Many of the people I knew, along with descendants of the people who had been involved in the Roswell incident, told me their stories."

He said the descendants included the son of an undertaker who provided "coffins for the alien bodies" and the son of a sheriff who "kept traffic away from the crash site".

Mitchell was originally supposed to appear live at a conference in Mexico of 6,000 people, but instead appeared via video link stating that at 84 he was too old to travel. Ahead of the conference, he spoke of why the authorities have kept "alien visitations above top secret."  Mitchell also said that we don't know what beings are in the Universe because our planet is like a grain of sand on a huge beach.

"A family friend who was a major in the United States Air Force told me it was all real."

"I got the stories from all of these various people into my head when I came back from the moon, and I then went to the Pentagon and told them my story about that and said, give me your opinion. The admiral who I spoke to said, 'I don't know anything about it, but I'm going to find out.' He went out to New Mexico and checked all around, came back and told me, 'Your stories are quite correct and all real.'"

Mitchell also claimed that the government found aliens that were both death and alive. However, they covered up the incident because they didn't know if the visits were hostile and they did not want Soviet Russia learning anything about it. The government didn't want the advanced technology of the alien saucer to fall into the Soviet's hands.

"The best course of action was to just lie about it, and keep it to themselves. They labeled it 'above top-secret,' and that created the long-running iron curtain separating a secret group within the government, and the American public."

The aging former astronaut was the sixth man to walk on the moon as part of the Apollo 14 mission.