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Challenger Deep, 35,994 feet, or 6.8 miles. Mt Everest is 29,029 feet high, so the scope from lowest to highest point is only 65,023 feet, or about 12 miles -- 10 minutes driving at highway speeds.Not only is the Earth spherical enough for precision ball bearings, it is also smooth enough.
Challenger Deep, 35,994 feet, or 6.8 miles. Mt Everest is 29,029 feet high, so the scope from lowest to highest point is only 65,023 feet, or about 12 miles -- 10 minutes driving at highway speeds.
Not only is the Earth spherical enough for precision ball bearings, it is also smooth enough.
