A dark patch in Mars' Utopia Planitia region has grown significantly since it was first photographed in 1976. Scientists have a loose understanding of what it is, but they can't properly explain its g... When you buy through links on our articles, Future and its syndication partners may earn a commission. A massive dark patch lurking within a giant Martian crater has been creeping across the Red Planet's surface since the feature was first spotted 50... [2968 chars]
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