Photo: Mars Close-Up Casts Doubts on Signs of Recent Water

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Martian gullies—like those seen above in these high-resolution images from the Mars Reconnaissance Orbiter—show the same channels, terraces, and other features seen in water-carved regions on Earth.

Analysis of new images from the orbiter are casting doubt on previous geologic signs that liquid water may flow near the planet's surface.

Images © Science

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