Chandrayaan and lunar exploration

Chandrayaan-1, launched in 2008, was India's first mission to the Moon. It carried instruments from India and abroad, and its Moon Mineralogy Mapper found evidence of water molecules on the lunar surface, a discovery that changed how scientists thought about the Moon. Until then the Moon was widely seen as dry; the finding that water exists, locked in minerals and possibly as ice in shadowed polar craters, made the lunar poles a target for future exploration.

Chandrayaan-2, launched in 2019, carried an orbiter, a lander named Vikram and a rover named Pragyan. The orbiter succeeded and continues to send data, but the lander lost contact during its final descent and did not achieve a soft landing. The mission is often cited as an example of partial success: the orbiter's instruments produced valuable science, while the landing failure showed how difficult the final minutes of a lunar descent are, when a spacecraft must slow from orbital speed to a gentle touchdown with no atmosphere to brake against.

Chandrayaan-3, launched on 14 July 2023, achieved what its predecessor had not. Its Vikram lander touched down near the lunar south pole on 23 August 2023, at about 18:04 Indian Standard Time, making India the fourth country to achieve a soft landing on the Moon and the first to land near the south pole. The Pragyan rover then rolled out and carried out measurements on the surface for about one lunar day, roughly fourteen Earth days, before the lunar night ended surface operations.

The south pole matters because its permanently shadowed craters may hold water ice, which could in principle supply drinking water, oxygen and even rocket propellant for future missions, reducing what must be carried from Earth. Chandrayaan-3's scientific instruments studied the surface composition, temperature and seismic activity, adding to the global picture of a region no country had landed in before.

Lunar exploration also has a strategic and inspirational dimension. It demonstrates deep-space navigation, autonomous landing and thermal engineering, and it gives a country's scientists and engineers experience that feeds into other missions. For India, the sequence from orbiter to attempted landing to successful landing shows a deliberate learning pattern: each mission carried forward the instruments and lessons of the last.