How can motion be observed?
by chronicly staring at it
If tiny particles like pollen are added to clear water and observed through a micrscope they will be seen to move about randomly. This was an early clue to the fact that matter is made of individual molecules which, in the case of liquids and gases, move about to cause the Brownian motion of the particles first observed by botanist Robert Brown.
No, the speed of light is absolute. No matter from what frame of reference you measure it, it will always measure the same. This is because time (interval) and motion are compliments. As motion changes, interval changes. As you increase your relative motion, your clock (as "observed" by an external observer) slows down.
Brownian motion is defined as the continuous and random motion of the particles suspended in a liquid or in a gas. It is caused by the collision of these particles with each other and with the molecules of the surrounding medium due to their random movement with varying velocities. It was discovered by Robert Brown in the year 1927. He observed that pollen grains when placed in water are not at rest but move continuously…