Future rocket planes may circle the globe in 51/2 hours. At 3600 m.p.h., the plane travels about 19,500 miles. Earth's rotation adds 5500 miles to total.
Future rocket planes may circle the globe in 51/2 hours. At 3600 m.p.h., the plane travels about 19,500 miles. Earth's rotation adds 5500 miles to total.
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