The particles are so small that even though they will hit the atmosphere at about 125,000 mph, instead of burning up, triggering so-called "shooting stars," they will be stopped entirely, predicts astronomer Paul Wiegert, with the University of Western Ontario in Canada.
The only visible and detectable sign of the comet dust might be a proliferation of bright blue clouds at the edge of space. Scientists suspect these so-called noctilucent, or "night-shining" clouds are be seeded by dust in the upper atmosphere.
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Eventually, the trapped comet dust will make its way -- silently and invisibly -- to the planet's surface.
Comet ISON, which was discovered in September 2012 by amateur astronomers in Russia, is believed to be making its first swing into the inner solar system, so unlike repeat fliers, it hasn't laid down a rich dust trail from previous orbits for Earth to fly through.
ISON is an acronym for the telescope the astronomers were using, the International Scientific Optical Network.