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NASA says that roughly 4,700 asteroids orbit close enough to Earth for us to be concerned for our safety — at least a little.
Just when we thought we had escaped Armageddon, this: NASA announced late Wednesday that approximately 4,700 potentially hazardous asteroids (PHAs) are currently buzzing around “near” Earth. The estimate — which could be off by as many as 1,500 PHAs — is based on analysis of new information gathered by NASA’s Wide-field Infrared Survey Explorer (WISE) telescope.
NASA defines PHAs as any asteroid within 5 million miles of Earth that has a diameter greater than 330 feet (or 100 meters). At that size, the asteroid would be large enough to survive the plunge through Earth’s atmosphere, thus allowing them to wreak havoc on humanity.
The updated PHA estimate comes as a result of the a WISE mission called “NEOWISE.” As part of NEOWISE, NASA scientists sampled 107 PHAs to come up with their 4,700 PHA figure, as well as other predictions about the population of PHAs in general. Only about 20 to 30 percent of the PHAs have yet been detected.
More: http://www.digitaltrends.com/intern...-asteroids-pose-risk-for-earth/#ixzz1vJzOqqar
Just when we thought we had escaped Armageddon, this: NASA announced late Wednesday that approximately 4,700 potentially hazardous asteroids (PHAs) are currently buzzing around “near” Earth. The estimate — which could be off by as many as 1,500 PHAs — is based on analysis of new information gathered by NASA’s Wide-field Infrared Survey Explorer (WISE) telescope.
NASA defines PHAs as any asteroid within 5 million miles of Earth that has a diameter greater than 330 feet (or 100 meters). At that size, the asteroid would be large enough to survive the plunge through Earth’s atmosphere, thus allowing them to wreak havoc on humanity.
The updated PHA estimate comes as a result of the a WISE mission called “NEOWISE.” As part of NEOWISE, NASA scientists sampled 107 PHAs to come up with their 4,700 PHA figure, as well as other predictions about the population of PHAs in general. Only about 20 to 30 percent of the PHAs have yet been detected.
More: http://www.digitaltrends.com/intern...-asteroids-pose-risk-for-earth/#ixzz1vJzOqqar