...LOL the mythical entrances to Hell...

... or stray 'dark matter'...
http://en.wikipedia.org/wiki/Dark_matteror worm holes.. interdimensional holes... like mini Stargates....
vortexes...
http://www2b.abc.net.au/science/wormholes/posts/topic37.shtmhttp://www.guns.connect.fi/innoplaza/energy/index.htmlhttp://www.burlingtonnews.net/orbs.html"High Electromagnetic distortions create 'Temporal Event Horizons' (ie. black holes, vortexes) which allows the orb to pass through with no difficulty. The Temporal Event Horizon acts as a buffer helping to keep the orb in a state of constant energy and stability while slipping just outside of time and space."
Depending on the size of what is coming through from the higher dimension into our third dimension will be the size of distortion in the plasma (ether) field. I will try to describe to you as I see this plasma field (space) and matter within:
Space is a fluid ..Hence a field of plasma..Hence a 'plasma field'. . Its motion or state of being is 'Guided by Matter' . Thus an orb or space craft or other type of matter going through it would affect its field. Think of a boat propelling itself through water - the faster and larger the boat - the more distortion of the water it is going through .
According to Charles Vind , "A particle (matter) with positive gravity would have a spin rotating inward pulling in fluid and an a particle with negative gravity would have a spin pushing out fluid or an outward spin. The faster the rate of motion or rotation (frequency) would thus determine the gravity and therefore the mass of the particle. So all elementary particles of matter would essentially be FLUID in MOTION around a CLOSED CIRCULAR PATH. All forms of matter could also be seen essentially
as specific PATTERNS of MOTION in the great SEA of FLUID that constitutes the PHYSICAL UNIVERSE."
This fluid is a life force to matter. It feeds matter with energy and this energy is 'electromagnetic' ..thus it falls under 'electromagnetism'
Taking the above into consideration, lets advance the Interdimensional travel theory of the orbs to something a little more complicated"