The National Space Commission recently approved its fifth lunar mission, called the Lunar Polar Exploration Mission (LUPEX). Unlike the Chandrayaan 1 to 4 missions, this upcoming LUPEX mission is a collaboration between India and Japan. However, it remains part of India's broader lunar mission series, which aims to eventually send an Indian astronaut to the Moon and bring them back safely. It's important to note that no astronauts will be sent as part of the LUPEX mission itself. The Union Cabinet had approved the Chandrayaan-4 mission on September 18, and the LUPEX mission is expected to be presented for cabinet approval soon.
Although ISRO and Japan's space agency JAXA signed an agreement in 2017, progress on the Lupex mission was delayed after India's Chandrayaan-2 was unable to successfully demonstrate a soft landing on the lunar surface. The LUPEX project is designed to explore the Moon in search of water and other valuable resources. It also aims to develop skills and knowledge in studying the lunar surface. The LUPEX project is a joint international effort, where Japan's space agency (JAXA) is building the lunar rover, and India's space agency (ISRO) is creating the lander that will transport the rover to the Moon.
Other space agencies will also send scientific instruments for the mission. NASA's Neutron Spectrometer will search for hydrogen up to 1 metre (3.3 feet) below the surface at the Moon's south pole. Meanwhile, the European Space Agency's (ESA) Exospheric Mass Spectrometer will measure gas pressure and identify chemical signatures on the surface.
Interestingly, the global interest in the Moon is growing and that has been highlighted by the Artemis mission, a US-led initiative aimed at sending astronauts back to the Moon. The goal is to establish a long-term presence on the lunar surface and carry out ongoing exploration activities.
“Recent studies of different observation data suggest that water might exist in the lunar polar regions. These regions are located near the Moon’s north and south poles. If water is discovered in these areas, it could be used as a source of energy for future human missions on the Moon. This is why many countries are actively pushing forward with lunar exploration efforts,” space expert Girish Linganna said.
JAXA is developing a rover that will move independently to look for spots on the Moon where water may be found. “It will use a drill to dig into the ground and collect soil samples. The plan is to gather data by closely analysing these samples with the observation tools installed on the rover. The rover will carry tools to measure the water content in lunar soil (called regolith), as well as equipment for drilling and collecting samples. It will also feature advanced technologies for its driving system and batteries, which are some of the first of their kind in the world. The project faces a big challenge—getting a rover that weighs several hundred kilogrammes, loaded with all these tools, to the Moon, moving it around, and analysing the samples directly on-site,” added Linganna.
As per JAXA, the rover is still in the basic design stage, and she often encounters challenges when building prototypes and conducting tests. During these tests, they spread sand similar to lunar soil at the test site and run the rover prototype over it. The team constantly adjusts the sand's softness to match the actual Moon's surface and tweaks the unevenness to ensure the rover can move properly. They also carefully study how much the rover’s tracks (which act like its tires) sink into the sand, making small adjustments each time. It's a complex process with no simple solutions.
ISRO has developed advanced technology for operating lunar orbiters, landers, and rovers. However, for the LUPEX project, they will need to create a larger rover than ever before. The goal is to make a significant international impact by combining ISRO's expertise with JAXA's rover technology and tools for measurement and analysis.
As per Inoue Hiroka, a researcher with the Lunar Polar Exploration Project Team at JAXA's Space Exploration Center, one of the key tasks ahead is selecting a specific landing site. The plan is to land in the Moon’s south polar region, which is believed to have a high chance of containing water. However, this area has very few flat spots that are ideal for landing and ensuring good lighting and communication. Since other countries might choose the same area, the team aims to announce their landing site as soon as they identify the best location.
If the mission gathers detailed information about water on the Moon, it could open possibilities not only for living on the Moon but also for using this water to produce fuel. This would allow us to travel to farther planets, pushing the boundaries of human exploration.