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NASA's Curiosity rover has found evidence of an ancient lake in an area of Mars that was expected to be drier.
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The rover found wave-rippled rocks on the surface of rocks, providing the best evidence of water and waves seen in the mission so far.
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The rover has previously found evidence of dried-up lakes on Mars in the form of salty minerals.
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The discovery of wave-rippled rocks in the Gale Crater was a surprise to NASA scientists.
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Curiosity is exploring the foothills of a three-mile tall mountain known as Mount Sharp.
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The rover has also spotted debris in a valley that was washed down by wet landslides on Mount Sharp.
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The landslide debris is the most recent evidence of water on Mars and will allow scientists to study layers higher up on Mount Sharp.
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Mount Sharp provides a Martian timeline to scientists, with the oldest layers at the bottom and youngest at the top.
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The study of Mount Sharp will allow scientists to understand the evolution of Mars from a warm, water-abundant planet to a freezing desert.
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Another Mars rover, Perseverance, has landed on the Red Planet to search for signs of past microbial life and will send back rock and soil samples for analysis in the 2030s.