Magnetohydrodynamics is the science that best replicates what witnesses of UFO sightings describe. A plasma sphere around an MHD craft will make that craft appear as a glowing ball of light. That same plasma absorbs radio waves and thus makes the craft invisible to radar. Does this sound like any UFO sighting you've ever heard of before? Understanding the science of Magnetohydrodynamics aids the ability to comprehend plasma, fusion and electromagnetic based propulsion technologies. The secret is now available to you.