PASADENA, Calif. — The U.S. Defense Advanced Research Projects Agency (DARPA) and NASA are preparing to co-host an international conference this year focused on ridding space of manmade debris endangering spacecraft orbiting the Earth.

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Leonard David has been reporting on space activities for nearly 50 years. He is the 2010 winner of the prestigious National Space Club Press Award and recently co-authored with Apollo 11’s Buzz Aldrin the book “Mission to Mars — My Vision for Space...