No, it's not global terrorism.
The scientists will map ways to combat an asteroid attack, a cosmic sucker punch like the collision that killed the dinosaurs 65 million years ago and flattened a Siberian forest in 1908.
While the world's attention is focused on the real threat of terrorism, the theoretical asteroid menace has been garnering a surprising amount of behind-the-scenes attention.
Britain's Royal Astronomical Society hosted an international meeting of experts on the asteroid impact threat in December. In January the world's astronomers petitioned Australia's government to fund a special asteroid-detecting telescope. In February NASA announced the "Workshop on Scientific Requirements for Mitigation of Hazardous Comets and Asteroids," which will be conducted in Washington in September. In March, NASA activated "Sentry," a new system to monitor near-Earth objects (NEOs) and assess their threat to Earth.
NEOs are small objectsasteroids and certain cometsthat orbit in the solar system relatively close to Earth and could one day collide with Earth.
"We've had a couple of close shaves during the past few months," says Brian G. Marsden, with the Harvard
Smithsonian Center for Astrophysics in Cambridge, Massachusetts.
One asteroid caused public jitters when discovered March 12. Named 2002 EM7, it came from the direction of the sunan astronomical blind spot where objects are hidden in the sun's glare.
Astronomers didn't detect 2002 EM7 until four days after it came within 288,000 miles (460,000 kilometers) of Earth, which they regarded as a close encounter. [The moon is about 239,000 miles, or 385,000 kilometers, from the Earth.]
The asteroid was about 200 feet (60 meters) in diameterbig enough to fill... [continues]
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