Antigravity propulsion

From TinWiki.org

Antigravity Propulsion is when a mass moving faster than 57.7 percent of the speed of light will gravitationally repel other masses lying within a narrow 'antigravity beam' in front of it. This "beam" intensifies as the speed of the mass approaches that of light.

Sources

http://www.space.com/businesstechnology/060215_technovel_antigravity.html

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