Final answer:
In 1905, Albert Einstein made significant contributions to physics by creating special relativity, proposing photons as quanta of electromagnetic radiation, and developing a theory of Brownian motion. In 1915, he published his theory of general relativity, revolutionizing the understanding of gravity and space-time.
Step-by-step explanation:
In 1905, Albert Einstein published several papers that made significant contributions to physics. He created special relativity, proposed the idea of photons as quanta of electromagnetic radiation, and developed a theory of Brownian motion that allowed for the measurement of the size of atoms and molecules.
In 1915, Einstein published his theory of general relativity, which provided a new understanding of gravity and space-time. This theory revolutionized the field of physics and has since been confirmed through various experiments and observations.