spacecraft detects lake on saturn\s moon
Last Updated : GMT 05:17:37
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Last Updated : GMT 05:17:37
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The findings published in science journal

Spacecraft detects lake on Saturn\'s moon

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Saturn's largest moon Titan
London - Arabstoday

Saturn\'s largest moon Titan London - Arabstoday   In a surprise find, scientists say they have spotted hints of a methane-rich lake and several ponds near the equator of Saturn’s biggest moon. Lakes were previously spied near Titan’s polar regions. It was long thought that bodies of liquid could not exist at Titan’s midsection because energy from the sun at those latitudes would cause methane pools to evaporate. “This discovery was completely unexpected because lakes are not stable at tropical latitudes,” said planetary scientist Caitlin Griffith of the University of Arizona, who led the discovery team. By measuring reflected sunlight from Titan’s surface and atmosphere, the international Cassini spacecraft detected a dark region near the landing site of Huygens, a companion probe that parachuted to Titan’s equator in 2005. Scientists said further analysis of the dark feature suggests the presence of a 927-square-mile (2,400 square-km) hydrocarbon lake — twice as big as Lake Champlain, a freshwater lake that borders upstate New York and Vermont. Near the equatorial lake were hints of four shallow ponds similar in size and depth to marshes on Earth. The findings were detailed in Thursday’s issue of the journal Nature. Titan is among the few bodies in the solar system with a dense atmosphere, but scientists have wrestled over the source of the thick blanket of nitrogen and methane. Methane gas in the atmosphere is constantly broken up by sunlight and falls to the surface where it is transported back to the poles, condensing to form lakes. Scientists do not think this process is driving the presence of mid-latitude lakes and ponds. Rather, they think there may be an underground source of methane that periodically vents to the surface to form the hydrocarbon bodies of liquid. “Titan may have oases,” Griffith said. David Stevenson, a planetary scientist at the California Institute of Technology, said the latest find was interesting, but noted that the evidence was indirect. If a subterranean source of methane is confirmed, it’s a step toward understanding the persistence of methane in Titan’s atmosphere, said Stevenson, who was not part of the research team.

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