NG Space Mysteries Target Earth (HDTV) x264[Ahashare]

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HDTV  English


Video  1280 x 720


Audio  6 Channel





Rocky asteroids and icy comets have bombarded Earth since its formation 4.5 billion years ago. 





But perhaps the most famous impact of all was caused by the six-mile-wide comet or asteroid that annihilated the dinosaurs 65 million years ago. 





While impacts have been rare in our era, objects large enough to cause a planetwide disaster still pass ominously close to Earth's orbit, and the threat of collision remains.





Fortunately, we're learning how to protect ourselves from these cosmic invaders. 





New telescope systems with powerful cameras will aid in finding tens of thousands of small asteroids and comets large enough to destroy a city or state. 





Scientists are working on methods to deflect an incoming body using ingenious systems that over time can push or pull an object away from a collision course with Earth. 





Other scientists propose bombing large objects into small, less threatening pieces. 





Although our planet has been bombarded for eons, only 174 scars from impacts have been found. 





Many hundreds or thousands of others have been obliterated by erosion or vegetation or hidden under the ocean. 





The impact craters are the result of tremendously destructive forces, yet many are beautiful. 





Geologists see them as a window into the early Earth, helping to answer questions about how it and other terrestrial planets formed and evolved.





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