Light
Part of the Einstein exhibition.
Einstein was fascinated by the nature of light.
In 1905, nearly a decade after this first "thought experiment," Einstein answered these questions with his Special Theory of Relativity. The theory, which revolutionized our understanding of time and space, is based on Einstein's astonishing recognition that light always travels at a constant speed, regardless of how fast you're moving when you measure it. Einstein's explorations into the fundamental properties of light also laid the groundwork for his most impressive achievement, the General Theory of Relativity.
