The risk of unavoidable catastrophic collisions between objects in low Earth orbit (LEO) will continue to grow despite mitigation efforts and will only be solved by physically removing spent vehicles and dead satellites, the U.S. Defense Advanced Research Projects Agency (Darpa) warns. Darpa says since January 2007 there has been 50% increase in the number of cataloged debris objects, largely due to the intentional destruction of the Fengyun-1C satellite by the Chinese in 2007, as well ...


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