Even if the tube does not pass through the exact center of the Earth, the time for a journey powered entirely by gravity (known as a gravity train) always works out to be 42 minutes, so long as the tube remains friction-free, as while the force of gravity would be lessened, the distance traveled is reduced at an equal rate. The time for such a journey works out to be 42 minutes. The first half of the journey consists of free-fall acceleration, while the second half consists of an exactly equal deceleration. In 1966, mathematician Paul Cooper theorized that the fastest, most efficient way to travel across continents would be to bore a straight hollow tube directly through the Earth, connecting a set of antipodes, remove the air from the tube and fall through.The angle rounded to whole degrees for which a rainbow appears (the critical angle).42 is the atomic mass of one of the naturally occurring stable isotopes of calcium.
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