(Gravity has not actually disappeared in outer space, as many science books erroneously claim. The sun’s gravity is powerful enough to whip the planet Pluto in its orbit billions of miles from Earth. Gravity has not disappeared; it has just been canceled by the falling of the rocket ship beneath your feet.) This is called the “equivalence principle,” in which all masses fall at the same rate under gravity (more precisely, the inertial mass is the same as the gravitational mass).
