The search for water on Mars: Figure 13 Mariner 4 image of the martian surface. The image is about 460 km wide, and shows some large impact craters (circular features), but no signs of any water-formed features. Image credit: NASA.

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The search for water on Mars

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This figure shows a photograph taken from orbit of the martian surface. It is in greyscale and is heavily pixelated. Several circular features are evident, which are craters.

Figure 13 Mariner 4 image of the martian surface. The image is about 460 km wide, and shows some large impact craters (circular features), but no signs of any water-formed features. Image credit: NASA.

4.1 How it all began: a tale of why resolution matters

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