what did robert hooke discovered

Robert Hooke was an English physicist, natural philosopher, and architect who made significant contributions to various fields of study. He discovered the law of elasticity, known as Hookes law, which states that the stretching of a solid body is proportional to the force applied to it. He also designed and improved the compound microscope, which he used to discover microorganisms and the intricate internal structure of living things. Hooke was the first to suggest that Jupiter rotates on its axis and discovered the fifth star in the Trapezium, an asterism in the constellation Orion. He was appointed professor of geometry in Gresham College and became Curator of Experiments of the newly formed Royal Society of London, where he was responsible for demonstrating new experiments at the Societys weekly meetings. Hookes most famous work was his 1665 discovery of the living cell, which he observed while examining cork through his microscope.