Mars may seem to be an alien world, but many of its features look eerily familiar--such as this ancient, dried-up river system that stretches out for nearly 700 kilometres across the surface, making it one of the longest valley networks on the planet.
Mars may seem to be an alien world, but many of its features look eerily familiar--such as this ancient, dried-up river system that stretches out for nearly 700 kilometres across the surface, making it one of the longest valley networks on the planet.
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