1.   As the star shrank, the gravitational field at the surface would become stronger and the escape velocity would increase.

2.   Both Earth and Moon have gravitational fields that allow bodies that would have missed them without their gravitational attraction to hit them.

3.   Both Mercury and Mars have gravitational fields too low to retain an atmosphere.

4.   Here is a gravitational field device to draw down orbiting objects on to a preprogrammed landing site.

5.   In the Jupiter fly-by, the ship had used the gravitational field of the planet to increase her velocity.

6.   Let us return to our sphere of particles dropping in a gravitational field.

7.   Now there was new prey for the clashing gravitational fields.

8.   The gravitational field generated in its productive phase by the legislative cycle attracted items from several diverse sources.

9.   The gravitational field has been explored in some detail by observations of the satellites and of the paths of fly-by spacecraft.

10.   Thus, in particular, heavenly bodies moving in a gravitational field are well described by such geodesics.