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	<title>Science &#38; SpaceCategory: Volcanoes &#124; Science &#38; Space &#124; TIME.com</title>
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		<title>Science &#38; SpaceCategory: Volcanoes &#124; Science &#38; Space &#124; TIME.com</title>
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		<title>Volcanoes on Venus? New Clues, and Mysteries, About Earth’s Boiling Twin</title>
		<link>http://science.time.com/2013/01/02/volcanoes-on-venus-new-clues-and-mysteries-about-earths-boiling-twin/</link>
		<comments>http://science.time.com/2013/01/02/volcanoes-on-venus-new-clues-and-mysteries-about-earths-boiling-twin/#comments</comments>
		<pubDate>Wed, 02 Jan 2013 16:40:29 +0000</pubDate>
		<dc:creator>Michael D. Lemonick</dc:creator>
				<category><![CDATA[Space]]></category>
		<category><![CDATA[Volcanoes]]></category>

		<guid isPermaLink="false">http://science.time.com/?p=12628</guid>
		<description><![CDATA[It’s got to be frustrating for planetary scientists that the world closest to Earth and most similar in size as well—so similar that it’s often described as our planet’s twin—is in many ways the toughest to study. Venus’ perpetual shroud of thick, opaque clouds makes it impossible to see the surface with even the most powerful telescopes, and its sweltering surface temperature (think 900°F) makes it impossible for landers to survive for more than a few minutes. Nevertheless, orbiting spacecraft armed with radar and other instruments have taught scientists quite a lot about Venus’ atmosphere over the years, and even its surface—and a new study in Nature Geoscience is now reporting another, intriguing piece of information. The European Space Agency’s Venus Express has detected a sharp decline in sulfur dioxide (SO2) concentrations in the planet’s atmosphere following a spike in SO2 just after the probe arrived in 2006. The most plausible explanation, says lead author Emmanuel Marcq, is a volcanic eruption, caught in the act. (PHOTOS: The Transit of Venus: Photographs from a Rare Celestial Event) It’s not the only possible explanation, he admits. “We know that on Earth there are long-term atmospheric cycles, so it could happen on Venus as well. We can’t dismiss this possibility at the moment.” Volcanoes, however, are a lot more likely. One reason is that they’re known sources of SO2, at least on Earth. Another is that Venus is peppered with them — hundreds upon hundreds of volcanic mountains, lava flows and other features that make the planet’s history of volcanism unmistakable. Most of them appear to be long dead, but there have been hints in the past that a few might still be active. In the early 1990’s for example, radar on the Magellan spacecraft detected what appeared to be fresh lava, and back in the early 1980’s Pioneer Venus documented SO2 levels nearly 50 times higher than anyone expected, followed by a steady dramatic decline. “It’s very similar,” he says, “to the one we’re observing now.” If a volcano really did erupt just<img alt="" border="0" src="http://stats.wordpress.com/b.gif?host=science.time.com&#038;blog=13785469&#038;post=12628&#038;subd=timeecocentric&#038;ref=&#038;feed=1" width="1" height="1" />]]></description>
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	<primary_category>Volcanoes</primary_category><primary_category_link>http://science.time.com/category/volcanoes/</primary_category_link><featured_image>http://timeecocentric.files.wordpress.com/2012/12/1333_90758027.jpg?w=240</featured_image>
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			<media:title type="html">A volcano named Sapas Mons dominates this computer-generated view of the surface of Venus.</media:title>
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			<media:title type="html">mikelemonick</media:title>
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