Fig3_2 Random and ordered motion

Fig3_2 Random and ordered motion

Fig. 3.2 . Particles within a hot gas (left) move here and there in random directions that continually change as the result of collisions between particles. This supports the gas against inward gravitational forces. A planet or star (right) moves along a well defined, ordered trajectory determined by external gravitational forces upon it. When a large number of stars have gathered together and are confined within a star cluster, the stars also move in random directions, supporting their combined gravitational pull.

Copyright 2010, Professor Kenneth R. Lang, Tufts University