UFOs are real and there is life out there. That might be the conclusion some will reach upon hearing that news that Buzz Aldrin, the second man to set foot on the moon, and two other deceased astronauts passed lie detector tests over what they saw during their space missions. Of course, that only means they were completely convinced about what they saw. On some other day and in some other context, that would almost be equated to being a little loony.

There’s not 100% accurate way to tell if someone’s lying or not. The best we can do is read body language or, in the case of lie detectors, analyze biometrics and voice patterns. The latter is what the Institute of BioAcoustic Biology in Albany, Ohio used to determine the authenticity of three astronauts’ claims.

The problem with lie detectors is that they’re not infallible. In this case, for example, voice patterns simply indicate that Buzz Aldrin, Edgar Mitchell, and Gordon Cooper were completely convinced of what they saw. In other words, they weren’t lying when they were describing what they thought they saw. In lie detector tests, being convinced that something is true, even if it isn’t, is practically the same as telling the truth.

Aldrin described seeing an L-shaped object on his way to the moon, admitting that his logical mind couldn’t explain it. In interviews, both Mitchell and Cooper claimed to have seen more than one UFO. As far as they’re concerned, they’re telling the truth. Whether or not that was exactly what they saw, however, no lie detector test will be able to tell.