A new analysis of Mars' gravitational field has revealed hidden structures buried beneath the remains of an ancient ocean.

Seamless Wikipedia browsing. On steroids. Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface. Wikiwand ...

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Geographical Information Systems (GIS) are computer systems designed to collect, manage, edit, analyze and present spatial information. This course introduces the basic concepts and methods in mapping ...