There are currently 1,400 potentially hazardous asteroids that could pass close to Earth, according to latest data revealed by Nasa. An image mapping the orbits of all the potentially hazardous asteroids (PHAs) provides a graphic of the crowded cosmic activity. This graphic shows 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 Earth’s orbit
These asteroids are considered hazardous because they are fairly large – at least 460 feet or 140 meters in size. They are classified as PHAs because they follow orbits that are considered to pass close to the Earth’s, at or 7.5 million kilometres.
However, Nasa claims that being classified as a PHA does not mean that an asteroid…
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