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The Universe Is Throwing Rocks at Us: Scientists ID 4,700-Plus Asteroids That Could Hit Earth, Urge Warning System

Thousands of asteroids could hit Earth, and only 20 to 30 percent of them have been found.
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Well, not intentionally, of course. But NASA's Wide-field Infrared Survey Explorer (WISE) recently identified 4,700 potentially hazardous asteroids, give or take 1,500, with diameters bigger than 330 feet, with orbits that come within five million miles of Mother Earth. To boot, they are big enough to survive passing through Mother Earth’s atmosphere and wreaking havoc on a regional or larger scale, NASA reports.

“So far, an estimated 20 to 30 percent of these objects have been found,” NASA said in a recent statement.

The danger was big enough for many experts to urge the world's nations to create an asteroid-warning system. The Secure World Foundation (SWF) and the Association of Space Explorers (ASE), who held a conference on the issue last November, presented their findings to the United Nations Committee on the Peaceful Uses of Outer Space during a conference in Vienna, reported. It concurs with previous analysis by NASA.

"The NEOWISE analysis shows us we've made a good start at finding those objects that truly represent an impact hazard to Earth," said Lindley Johnson, program executive for the Near-Earth Object Observation Program at NASA Headquarters, in a statement. "But we've many more to find, and it will take a concerted effort during the next couple of decades to find all of them that could do serious damage or be a mission destination in the future."

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