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Thought to be billions of years old, the comet originated in the distant Oort cloud
-- a cloud of icy bodies well beyond the orbits of Neptune and Pluto
-- and somehow got propelled toward the inner solar system. It's never passed by Earth before, Phillips said. A much brighter comet show, meanwhile, is on the way. Comet ISON may come close to outshining the moon in November. It was discovered last September by Russian astronomers and got its acronym name from the International Scientific Optical Network. Neither Pan-STARRS nor ISON pose a threat to Earth, according to scientists. ___ Online: NASA: http://apod.nasa.gov/apod/ap130305.html Space Weather: http://spaceweather.com/
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