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6 March 2014 1:04 pm ,
Vol. 343 ,
Magdalena Koziol, a former postdoc at Yale University, was the victim of scientific sabotage. Now, she is suing the...
Antiretroviral drugs can protect people from becoming infected by HIV. But so-called pre-exposure prophylaxis, or PrEP...
Two studies show that eating a diet low in protein and high in carbohydrates is linked to a longer, healthier life, and...
Considered an icon of conservation science, researchers at World Wildlife Fund (WWF) headquarters in Washington, D.C.,...
The new atlas, which shows the distribution of important trace metals and other substances, is the first product of...
Early in April, the first of a fleet of environmental monitoring satellites will lift off from Europe's spaceport in...
Since 2000, U.S. government health research agencies have spent almost $1 billion on an effort to churn out thousands...
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ScienceShot: NASA Mission Finds Fewer Near-Earth Asteroids Than Expected
29 September 2011 4:12 pm
Bad news for little princes—there may be fewer Earth-neighboring asteroids for them to live on than thought. According to results released today by NASA's Wide-Field Infrared Survey Explorer mission, an infrared satellite that's been keeping its eye on asteroids zipping within 200 million kilometers of Earth's orbit, there are close to 20,000 near-Earth asteroids between 100 meters and 1 kilometer in diameter (shown on left). That's down from old guesses of about 35,000 (right). And nearly 15,000 of those rocks, which are big enough to crush an entire city, have yet to be discovered. The researchers also confirmed that astronomers have identified more than 90% of the nearly 1000 big asteroids of the dino-extinction variety. That's too late for Tyrannosaurus rex but perhaps not too late for us.
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