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Hundreds of years ago peoplebelieved that the Earth was completely flat and if you sailed to far then you would fall of the edge, a little like disc-world in the Terry Pratchett books. But with danger comes bravery, and soon enough brave explorers travelled the world in search of the edge and realised it was in a sphere shape. Until recently when we went into space we had no idea exactly what our Earth looked like.

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16y ago

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