Article / Updated 03-26-2016
When Einstein began his research as an amateur scientist, there were two major problems:
Light was known to be a wave but had to be considered as made up of lumps — not waves — to explain the ultraviolet catastrophe (the observation that hot objects emit less ultraviolet light and more light of other colors).In mechanics, the results of experiments are identical in motion or at rest (all motion is relative, and there is no absolute motion).