Sample return is a space mission strategy where spacecraft collect materials from celestial bodies, such as the Moon or asteroids, and bring them back to Earth for analysis. This process allows scientists to study the composition, structure, and history of these bodies in detail, which is not possible with remote sensing alone. One notable example of a sample return mission is the NASA Apollo program, which successfully returned lunar rocks and soil from the Moon. More recent missions, like JAXA's Hayabusa2, have collected samples from asteroids, providing valuable insights into the early solar system and the origins of life on Earth.