Sample return missions refer to space missions in which a spacecraft is sent to a celestial body, such as an asteroid or a planet, to collect samples of its surface material and return them to Earth for analysis. These missions are important for understanding the composition and geological history of the target body, as well as for studying the potential for microbial life or resources that may be present. Sample return missions typically involve a series of complex steps, including landing on the target body, collecting samples using a robotic arm or drill, and then returning the samples to Earth in a secure and controlled manner. These missions require advanced spacecraft technology, precise navigation and landing capabilities, and careful planning to ensure the safe return of the samples. Some famous sample return missions include the Stardust mission, which collected samples of a comet's dust and returned them to Earth in 2006, and the Hayabusa mission, which returned samples from an asteroid in 2010. These missions have provided valuable insights into the composition and formation of celestial bodies in our solar system.