Cassini Spots Mini Nile River on Saturn Moon Titan
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 on 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 the same Titan sea,” said Jani Radebaugh, a Cassini radar team associate at Brigham Young University, Utah. “Such faults 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.
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