A miniature extraterrestrial version of Africa’s Nile River Valley has been spotted on Saturn’s moon Titan – it stretches more than 400 km from its “headwaters” to a large sea.  

Have you ever before seen such a large river system in high resolution outside Earth?  No, you have not. 

Scientists deduce that the river is filled with liquid because it appears dark along its entire extent in the high-resolution radar image, indicating a smooth surface.  
Titan is the only other world we know of that has stable liquid on its surface. While Earth’s hydrologic cycle relies on water, Titan’s equivalent cycle involves hydrocarbons such as ethane and methane.
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