I'm skeptical that pictures of rocks prove a stream flowed for a long period of time on Mars.
""From the size of gravels it carried, we can interpret the water was moving about 3 feet per second, with a depth somewhere between ankle and hip deep," said Curiosity science co-investigator William Dietrich of the University of California, Berkeley. "Plenty of papers have been written about channels on Mars with many different hypotheses about the flows in them. This is the first time we're actually seeing water-transported gravel on Mars. This is a transition from speculation about the size of streambed material to direct observation of it." "That's one heck of an inference for a man, but it sure makes for fantastic headlines that will boost support for more NASA missions to Mars.
""The shapes tell you they were transported and the sizes tell you they couldn't be transported by wind. They were transported by water flow," said Curiosity science co-investigator Rebecca Williams of the Planetary Science Institute in Tucson, Ariz. "Talk about projecting something local onto a foreign observation. Actually, that's being too kind. I'm sure there are examples of rounded rocks on earth that were rounded by some process other than being submerged in flowing water for a long time, but that isn't what NASA wants to report because it doesn't serve their interest in obtaining funding of stolen money for future missions.
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