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Published online 24 April 2007 | Nature | doi:10.1038/news070423-6
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Every cloud has an invisible halo
Unseen particles may confuse climate models.
Clouds are bigger than they look, according to new measurements by atmospheric scientists in Israel and the United States. They say that clouds are surrounded by a 'twilight zone' of diffuse particles, invisible to the naked eye, extending for tens of kilometres around the cloud's visible portion.
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