41. Some of the gaps are caused by moons and moonlets clearing their orbit of small-size material by gravitational attraction . 42. Measuring the mass ( by measuring gravitational attraction ) of the objects near them gives their individual rest mass. 43. You might think that the higher mass and hence gravitational attraction on Earth would lead to a greater density. 44. He tried to construct a theoretical basis for an inverse square law of gravitational attraction arising from Cartesian vortices. 45. Why does the gravitational attraction between two bodies depend on their masses but not what they are made from? 46. Brown dwarfs, whose energy comes from gravitational attraction alone, cool as they age and so progress to later spectral types. 47. This is probably due to the gravitational attraction between our galaxy and a concentration of mass like the Great Attractor. 48. Until several years ago, scientists were all but certain that the gravitational attraction among the galaxies would slow the expansion. 49. The horseshoe orbit arises because the gravitational attraction of the Earth changes the shape of the elliptical orbit of the asteroid. 50. Ever since, Mars has exerted a pull on our imaginations greater than the gravitational attraction that will eventually lead us there.
