Radiation pressure is a phenomenon in physics where electromagnetic radiation, such as light, exerts pressure on surfaces that absorb or reflect the radiation. This pressure arises from the momentum of photons that make up the radiation. Radiation pressure has applications in various fields, including astronomy, where it is used to study the dynamics of celestial bodies, and in optomechanics, where it is explored for manipulating and controlling the motion of micro- and nano-scale objects. Studying radiation pressure can also provide insights into fundamental physical principles, such as the interaction between matter and light.