In 1991 John Lear and Bob Lazar went public with a description of alien propulsion systems, as seen by Bob Lazar at Area 51. In short, the craft generate and amplify gravity which is directed towards the target region in space. Space-time is bent, attracting the target region to the craft and when the gravity amplification is turned off the target region, which now contains the craft, "snaps back" into its original position. Thus the craft instantaneously travels from one region in space-time to another, without actually travelling through space.
Conventional scientists state, ad nauseum, that travel faster than the speed of light through space is impossible and that Einsteins theories prove it. On this basis, they say, aliens from hundreds of light years away could not practically get here (lets ignore the closer ones for the time being).
So is there any scientific basis (ie. science as we know it) for the what Lazar has described?
Einsteins theory of general relativity describes space-time as a four dimensional "fabric" curved or bent around massive objects and that gravity is the effect, caused by this curvature. Furthermore, the degree of curvature of a region of space-time is directly related to the amount of energy and matter contained within that region. Theoretically, if a craft could generate enough energy it could, therefore, bend space-time as desired.
An enormous amount of power is needed to achieve this. Lazar describes the power source as an anti-matter reaction which releases all the energy of the reacting matter and anti-matter (far more powerful than a comparable nuclear fission or fusion reaction). This principal has been known to our scientists since the discovery of the positron (anti-electron) in 1932.
The propulsion system described uses pulsed gravity waves to achieve the necessary distortion of space-time. Again it was Einstein who predicted the existence of gravity waves, waves in space-time itself, created by intense gravitional events like the collapse of a star to become a black hole. In other words, the abrupt switching on (or off) of an intense gravitational field causes a wave motion in space-time. So far our scientists have not been able to detect gravity waves, but a lot of very expensive research is being done using huge resonant bar detectors and laser interferometers. This is one theory being taken very seriously.
So it seems that Lazar has not proposed anything that is not theoretically possible by our own scientific standards, its not that far out after all!
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