The only evidence is anecdotal reports and, of course, the obligatory photographs, found on the Internet by the thousand. I welcome any hypotheses that would explain how orbs could be a real phenomenon, but I haven't been able to find any. If there was any good science behind this, there would at least be some plausible proposals for what the orb might consist of, how and why it is generated by a dead body, why it floats in the air and also some good predictions about who will become an orb after they die, what size and color that orb would be, and where and when it can be found. There are lots of other things that a dead person might become, presumably and the only reason believers have chosen orbs seems to be that orbs are the most common unexpected objects seen in photographs. For example, there are no plausible hypotheses that describe the mechanism by which a person who dies will become a hovering ball of light that appears on film but is invisible to the eye.

The science behind this hypothesis is not clear. The usual hypothesis presented by believers is that orbs represent spirits of dead people, though some support variations on that. Orbs are among the class of paranormal phenomena that are visible only to cameras, and not to the naked eye. Orbs, formally called Spirit Orbs, are those semi-transparent white balls seen floating around in many photographs taken in ghostly locations. You're holding in your hand the very device responsible for tens of thousands of the most bizarre and unexplainable type of ghost photographs: Orbs.

Next time you pick up a camera, watch out.

What are white orbs in videos