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There are approximately 57.5 million square miles of land on earth, only 29.2 percent of the earth's surface.
Paris, France covers 33.6 sq miles.
Paris, France - 65 square miles according to: http://www.usatoday.com/travel/destinations/cityguides/paris/worthdoing.htm Paris, Texas - 44.4 sq miles
The Gobi Desert is about 1,000,000 square kilometers or 500,000 square miles.
Small particle accelerators can sit on a desktop, large circular ones can be miles across