31.   The gravitational forces of Jupiter and the nearby companion moons tug on Europa like dogs worrying a rubber bone, causing it to bend back and forth.

32.   The gravitational forces were so strong that some drivers had trouble moving their hands in the cockpit and were concerned for their safety.

33.   The outermost Callisto, almost as large as Ganymede, appears to exist in a deep freeze away from the gravitational tidal forces.

34.   The unit also perceives and records sudden shifts in gravitational force that may cause breakage when a ship sails into rough waters or a truck hits a pothole.

35.   Their presence raised concerns that the gravitational forces of such giants could have swept the inner region clear of small planets.

36.   This is possible, according to aviation writer William Langewiesche, because airplanes often bank in a way that neutralizes gravitational forces, so there is no seat-of-the-pants sensation.

37.   Those variations were in a pattern suggesting a slight wobble caused by the gravitational force of a massive planet in nearby orbit.

38.   Water does not bulge in between, because in these areas the gravitational force toward the moon and the centrifugal force away from the moon balance out.

39.   When it looped too close to the Jovian system two years ago, the gravitational forces of the giant planet pulled the original object into unstable fragments.

40.   Yet they could have supplied the decisive gravitational force to marshal ordinary matter into galaxies and clusters of galaxies.