Scientists discover mini Nile river on Saturn's moon Titan
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NASA scientists have spotted the longest extraterrestrial river system ever - on Saturn's moon Titan - and it appears to be a miniature version of Earth's Nile river.
The river valley on Titan stretches more than 400 kilometres from its "headwaters" to a large sea, a NASA Jet Propulsion Laboratory statement said.
In comparison, the Nile river on Earth stretches about 6,700 kilometres.
Images by NASA's Cassini mission have revealed for the first time a river system this vast and in such high resolution anywhere other than Earth.
Titan is known to have vast seas - the only other body in the solar system, apart from Earth, to possess a cycle of liquids on its surface.
However, the thick Titan atmosphere is a frigid one, meaning liquid water couldn't possibly flow. The liquids on Titan are therefore composed of hydrocarbons such as methane and ethane, Discovery News reported.
"Though there are some short, local meanders, the relative straightness of the river valley suggests it follows the trace of at least one fault, similar to other large rivers running into the southern margin of this same Titan sea," said Jani Radebaugh, a Cassini radar team associate at Brigham Young University, Utah.
"Such faults - fractures in Titan's bedrock - may not imply plate tectonics, like on Earth, but still lead to the opening of basins and perhaps to the formation of the giant
seas themselves," Radebaugh said.
In Titan's equatorial regions, images from Cassini's visible-light cameras in late 2010 revealed regions that darkened due to recent rainfall. Cassini's visual and infrared
mapping spectrometer confirmed liquid ethane at a lake in Titan's southern hemisphere known as Ontario Lacus in 2008.
"Titan is the only place we've found besides Earth that has a liquid in continuous movement on its surface," said Steve Wall, the radar deputy team lead, based at NASA's Jet Propulsion Laboratory.