A new space-based observatory could help NASA almost meet a congressional deadline for locating and cataloging most near-Earth objects (NEOs) down to 140 meters (460 ft.) across, according to a committee of the National Academies of Science. To meet the 2020 goal for tracking objects that would have extremely severe consequences for human civilization if they strike Earth, the panel says that a combination of space- and ground-based observation is “the best approach,” and could complete the ...


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