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|  Dr. Franklin Felber, speaking at the Space Technology and Applications International Forum, proposed an antigravity propulsion system. The Forum was held in Albuquerque, New Mexico, on February 14. Felber's proposal gives hopes to space enthusiasts that it may very well prove possible to accelerate a space craft to a speed approaching the speed of light without crushing the spacecraft in question or its cargo. Felber's paper states that a mass moving faster that 57.7 percent of the speed of light will then gravitationally repel other masses lying within a narrow antigravity beam in front of the moving object. The beam itself intensities as the speed of the mass approached the speed of light. Felber's theory conceptually changes the view about the viability of traveling to the far reaches of the universe.
A body, placed in a closed container, during a free fall experiment (for example, a fall from a high tower) experiences a weightlessness condition. It takes place due to the acceleration of the container filled with air, and all the parts of the body, caused by the influence of gravity — its equal and supporting force and pressure gradient is absent (it is not absolutely the same as in the case of a free fall of a body outside the container, apart from gravity, even the environmental force – the resistance force of the air acts on the body).
Unlike anti-gravity, zero gravity is a condition at which the gravitational forces acting on the body do not cause the mutual pressure of its parts on each other.
It is necessary to underline, that the effect of a gravitational field of any body, for example, the Earth, extends to as much distance as possible. It decreases according to the law of universal gravitation, but does not become zero at any point.
Anti gravity condition starts when the gravitation effect is compensated by some other force, called in classical physics as a “negative force”.
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