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The average barometric pressure of Pluto is about 0.015 millibars, falling in the 6.5-to-24 microbar range. A microbar is the equivalent of one one-millionth of an Earth atmospheric pressure, which places PlutoĆs barometric pressure (also referred to as atmospheric pressure) at 1/100,000 that of the Earth's barometric pressure. Source: http://www.eso.org/public/outreach/press-rel/pr-2009/pr-08-09.html, http://arxiv.org/abs/0901.4882
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