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== Mars == On [[Mars]], slabs of pebbly conglomerate rock have been found and have been interpreted by scientists as having formed in an ancient streambed. The gravels, which were discovered by [[NASA]]'s Mars rover [[Curiosity (rover)|Curiosity]], range from the size of sand particles to the size of golf balls. Analysis has shown that the pebbles were deposited by a stream that flowed at walking pace and was ankle- to hip-deep.<ref name="Mars1">{{cite web | url=http://www.jpl.nasa.gov/news/news.php?release=2012-305 | title=NASA Rover Finds Old Streambed on Martian Surface | publisher=[[Jet Propulsion Laboratory]] / [[California Institute of Technology]] | work=News | date=27 September 2012 | access-date=28 February 2016}}</ref>
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