NASA reveled the orbits of all the known Potentially Hazardous - TopicsExpress



          

NASA reveled the orbits of all the known Potentially Hazardous Asteroids (PHAs), numbering over 1,400 as of early 2013. These are the asteroids considered hazardous because they are fairly large (at least 460 feet or 140 meters in size), and because they follow orbits that pass close to the Earths orbit.They are classified as PHAs because they follow orbits that are considered to pass close to the Earths, at or 7.5 million kilometers. However, NASA claims that being classified as a PHA does not mean that an asteroid will impact the Earth. Thanks Mail Online for the details. Photo credit :NASA Follow them @ DailyMail on Facebook
Posted on: Thu, 23 Jan 2014 07:15:19 +0000

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