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The search for water on Mars
The search for water on Mars

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This figure is a photograph taken through a telescope. It shows a large black square, with a tiny orange feature that covers less than 1 % of the area of the image. The feature is oval with a tiny white mark at its southern pole.
Figure 5 Mars, taken using a telescope comparable to that used by astronomers in the 1800s. Image credit: NASA/Ron Wayman

 1 Observing Mars from Earth