I've demonstrated in my GHOSTWALKER video that
it's very easy to tell the difference between paranormal
orbs and dust on video. The independent movement
and response of these orbs is clearly different from
drifting specks of dust. Admittedly, still photos don't
allow that difference to be seen.
I question the ideas that "orbs" are ghosts,
aliens, or other sorts of beings. Sometimes,
other characteristics of a seemingly haunted
location, such as cold spots, unexplained
voice recordings (EVP) and ectoplasmic
or vortex images may help verify the
paranormal nature of the photographed
orbs. Or they may all be independent,
unrelated events. Orbs do seem demonstrate
some level of consciousness, but whether
they may be sentient is unknown.