17 June 2026
The Indian Space Research Organisation (ISRO) is making significant strides in lunar exploration, moving beyond the historic, yet time-limited, success of the Chandrayaan-3 mission. The agency is now focused on a formidable challenge: enabling a lunar lander to survive the Moon’s harsh, freezing nights and operate for up to 200 days. ISRO Chairman V. Narayanan announced this ambitious project, revealing a collaboration with the Department of Atomic Energy (DAE) to develop a critical technology—an advanced artificial heating system—that would protect the spacecraft from the extreme cold of the lunar night. “We are going to work on a project with DAE under the guidance of our minister, where we are going to develop objects… Thereby, this type of lander will survive for up to 200 days,” Narayanan stated during the CSIR-RISE Conclave in Bengaluru.
The challenge is rooted in the lunar environment itself, where a single day and night each last about 14 Earth days. The Chandrayaan-3 lander, Vikram, which made history on August 23, 2023, by becoming the first spacecraft to land near the Moon’s South Pole, was powered by solar energy. It successfully completed its primary objectives during the lunar day, with temperatures soaring to around 121°C. However, as the lunar night descended, temperatures plummeted to as low as -129°C, and in some polar regions, to nearly -180°C. The Vikram lander was not designed to endure these conditions, and with the loss of sunlight, it stopped working. “Vikram was fuelled by solar energy and therefore could operate for only 14 days during the lunar day when the Sun was visible on Moon’s surface. The lander stopped working with the onset of the lunar night,” Narayanan explained.
To overcome this limitation, the new project aims to create a lander with artificial heaters that can survive multiple lunar nights, enabling it to operate for approximately seven lunar days (or 200 Earth days). While the official phrasing is “artificial heaters,” this technology is widely understood to be a form of radioisotope heating, leveraging the expertise of the DAE. This nuclear-based solution is not for generating power but for providing a constant, reliable source of heat to keep the lander’s critical electronics and batteries warm through the long, freezing darkness. The core of this technology relies on radioisotope heater units, which use the natural decay of a material like plutonium-238 to produce heat. India has already tested this technology in space; two DAE-built radioisotope heater units flew on the Chandrayaan-3 propulsion module in 2023 as a quiet trial.
This new effort scales up that success into a system robust enough for a long-duration mission. However, the program faces a major bottleneck in the form of the fuel itself. Plutonium-238 is a scarce resource, produced at scale only by the United States and Russia, and India is now working to create a steady supply from its own reactors. “Keep a small box around the brain and the battery warm enough through the dark, drawing barely any power, and the machine that went to sleep can open its eyes again at dawn,” one analysis noted, underscoring the core engineering principle. The ability to survive the lunar night is a crucial capability that China has already demonstrated for over a decade with its Chang’e landers and Yutu rovers, and this effort brings India closer to matching that proficiency.
If this technology proves successful, it would represent a giant leap for India’s space program, transforming lunar landers from “fortnight tourists” into long-term residents capable of conducting extended scientific research. The ability to operate for months, rather than days, would allow scientists to monitor long-term environmental changes, perform complex experiments, and gather a far richer dataset from the lunar surface. This long-duration capability is not just an incremental improvement; it is a foundational element for India’s future, more ambitious lunar goals.
The technology is a critical precursor for the Chandrayaan-5 mission (also known as LUPEX), a collaborative effort with Japan’s space agency, which is slated to send a lander and rover to drill for water ice near the South Pole. The ISRO-JAXA mission is a prime candidate to be the first to demonstrate this life-extending technology. Beyond LUPEX, this innovation is essential for India’s broader space vision, which includes establishing the Bharatiya Antariksh Station by 2035 and sending an Indian crew to the Moon by 2040. The ability to survive the lunar night is a non-negotiable requirement for any sustained human presence or complex robotic operation on the Moon, making the development of this 200-day lander a pivotal step towards these historic national goals.
