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

2.   By collision and gravitational attraction, the larger planetesimals swept up the smaller pieces and became the planets.

3.   Stars are initially formed from gas, mostly hydrogen, and contract under their own gravitational attraction.

4.   Stars will remain stable like this for a long time, with heat from the nuclear reactions balancing the gravitational attraction.

5.   Their gravitational attraction would thus curve up the universe to infinitely small size.

6.   This hypothesis holds that giant tongues of material were torn from the preexisting Sun by the gravitational attraction ofa passing star.

7.   Although scientists have long known that the universe is expanding, they had assumed that the expansion was gradually slowing because of the gravitational attractions of the galaxies.

8.   Because of gravitational attraction, large masses on the other brane would tend to line up with large masses on our home brane.

9.   Einstein thought that all matter exerts some degree of gravitational attraction by bending the space around it, much as a bowling ball warps the plane of a trampoline.

10.   That means that each time the distance is halved, the gravitational attraction becomes four times as strong.