Bengaluru, India – S. Somanath, Chairman of the Indian Space Research Organisation (ISRO), recently outlined the agency’s future lunar exploration roadmap, detailing plans for the upcoming Chandrayaan-4 and Chandrayaan-5 missions. The announcements underscore India’s continued advancements in space technology following the successful soft landing of Chandrayaan-3 on the lunar south pole in August 2023. The proposed missions aim for significant milestones, including lunar sample return and advanced rover operations with extended mission durations.

Chandrayaan-4 is envisioned as India’s first lunar sample return mission. The objective is to retrieve a substantial amount of lunar material from the Moon’s surface and bring it back to Earth for scientific analysis. This mission profile would involve a complex architecture, likely comprising a lander module to collect samples, an ascent vehicle to lift off from the lunar surface, and an Earth return vehicle to bring the samples back. A successful sample return mission would provide scientists with invaluable opportunities to study lunar geology, origin, and evolution, potentially uncovering new data relevant to the Moon's resources and formation.

Following Chandrayaan-4, ISRO plans to deploy Chandrayaan-5, an advanced mission focused on in-situ lunar exploration with a significantly larger and more capable rover. Somanath indicated that this mission would feature a rover weighing approximately 350 kilograms, a substantial increase compared to Chandrayaan-3’s 26-kilogram PraGyan rover. A key operational target for this advanced rover is a mission life of 100 days, aiming to surpass the one lunar day (approximately 14 Earth days) operational lifespan of previous Indian lunar rovers. This extended duration would allow for more extensive terrain coverage and prolonged scientific investigations across a broader lunar area.

The planning for Chandrayaan-4 and 5 reflects ISRO's strategic progression in lunar science and technology. These missions build upon the foundation laid by Chandrayaan-1, which discovered water molecules on the Moon, and Chandrayaan-3, which demonstrated precision soft landing and mobile exploration capabilities near the lunar south pole. The detailed outlines provided by the ISRO chief emphasize the agency's commitment to expanding its capabilities in deep space exploration, contributing to global lunar science, and developing advanced autonomous systems.

Key details of the proposed missions include:

  • Chandrayaan-4: Focused on a lunar sample return objective, aiming to bring lunar material back to Earth.
  • Chandrayaan-5: Designed for advanced in-situ lunar exploration.
  • Rover Capabilities: Chandrayaan-5 is expected to feature a 350 kg rover, a significant upgrade in mass and capability.
  • Mission Lifespan: A target operational life of 100 days for future lunar rovers, enabling extended scientific data collection.
  • Leadership: Plans outlined by S. Somanath, Chairman of ISRO.

These outlined missions represent the next phase of India’s lunar program. ISRO will continue with detailed design and development phases for both Chandrayaan-4 and Chandrayaan-5, with further announcements regarding specific mission profiles, payload selections, and launch timelines anticipated as the projects mature. The progression of these missions is poised to solidify India's position in the global space exploration landscape and advance scientific understanding of Earth's natural satellite.