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Potentially Dangerous Asteroids (Images)

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Potentially Hazardous Asteroids Graphic Cropped

Credit: NASA/JPL-Caltech
This NASA graphic shows the orbits of all the known Potentially Hazardous Asteroids (PHAs), numbering over 1,400 as of early 2013. Shown here is a close-up…Read More »





of the orbits overlaid on the orbits of Earth and other inner planets. [Read the Full Story]   Less «
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Mike Wall

Michael was a science writer for the Idaho National Laboratory and has been an intern at Wired.com, The Salinas Californian newspaper, and the SLAC National Accelerator Laboratory. He has also worked as a herpetologist and wildlife biologist. He has a Ph.D. in evolutionary biology from the University of Sydney, Australia, a bachelor's degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what his latest project is, you can follow Mike on .
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