English for students of Physics – Vol 2

Besides the blowing dust and the heavenly bodies, little else moves on the Martian

landscape. This lack of movementmight seem to be strangest of all, for we humans are used

to motion. Almost from birth, infants follow motion with their eyes, and from then on we are

continually aware of things moving about, starting, stopping, turning, bouncing. On earth we

see liquids flowing, people moving, and the wind stirring the leaves of trees. Although we can

not see them, we know that the very atoms and molecules of matter are continuously in

motion.