In space exploration:
* To land on a celestial body: This is the primary purpose of a spacecraft designed specifically as a "lander." It's equipped to safely descend through the atmosphere (if applicable) and touch down on the surface.
* To conduct scientific research: Landers are often equipped with instruments to collect data about the composition, geology, atmosphere, and other properties of the celestial body.
* To deploy rovers or other exploration vehicles: Some landers act as a platform for deploying smaller robots to explore the surface more extensively.
* To establish a base for future missions: Landers can act as precursors to more complex missions, paving the way for future exploration or even colonization.
In other contexts:
* To perform a controlled landing: The term "lander" can also be used for aircraft or other vehicles that perform a controlled landing, such as a helicopter landing on a ship or a drone landing on a target.
Examples of landers:
* Viking landers: These spacecraft landed on Mars in the 1970s to search for life.
* Lunar lander: The Apollo Lunar Module that carried astronauts to the moon.
* Curiosity rover lander: The spacecraft that delivered the Curiosity rover to Mars.
* InSight lander: A mission to study the deep interior of Mars.
In essence, the purpose of a lander is to access the surface of a celestial body and perform scientific experiments, collect data, and/or deploy other vehicles to further explore the environment.
