Engineers Design 500-Watt Laser-Powered Rover to Explore the Moon’s Darkest Craters

A European concept proposes using a laser beam to power a rover deep inside the Moon’s permanently shadowed regions. The idea targets areas believed to contain water ice, one of the most sought-after resources for future exploration.

The approach, studied under ESA’s technology programs, would allow a robotic vehicle to operate where sunlight never reaches. Instead of relying on onboard power alone, energy would be transmitted over distances of up to 15 km, allowing the rover to keep moving in total darkness.

These regions have drawn growing attention in recent years. Several missions have detected hydrogen, a strong indicator of ice. According to NASA’s Lunar Reconnaissance Orbiter, with supporting data from Chandrayaan-1 and SMART-1, this ice could have remained stable for billions of years.

This resource could provide drinking water, produce oxygen, and even be turned into fuel. The challenge is that these regions are extremely cold and completely dark, making exploration difficult.

A Laser Instead Of Nuclear Power

Traditional solutions rely on nuclear-based systems such as radioisotope generators. These can provide steady energy, but they introduce complications. According to ESA robotics engineer Michel Van Winnendael :

“The standard suggestion for such a situation is to fit the rover with nuclear-based radioisotope thermoelectric generators.” Adding that such systems raise issues related to cost, engineering complexity, and heat management.

That heat can become a real issue. As explained by the released, published by ESA,rover that stays warm enough to function might end up affecting the ice it is supposed to study. A laser changes that setup by sending energy from a distance, limiting thermal impact on the local environment.

The concept builds on experiments conducted on Earth, where lasers have been used to keep drones flying for long periods. Applying this method on the Moon means adapting it to long-range transmission and much harsher conditions.

How The PHILIP System Works

The project, named PHILIP (powering rovers by high intensity laser induction on planets), was developed by Leonardo and Romania’s National Institute for Research and Development for Optoelectronics under ESA funding.

As reported by the European Space Agency, the mission would place a lander in a near-constant sunlight zone between de Gerlache and Shackleton craters. From there, a 500-watt infrared laser would continuously target a 250 kg rover as it moves into shadow.

The rover would convert the laser beam into electricity using modified solar panels. Sensors help maintain precise alignment, down to the centimeter. The route is also carefully planned, with slopes of about 10 degrees to ensure the rover always stays in direct line of sight.

Simulating the Moon to Test Communication Systems

The laser would not only supply energy. It could also handle communication. A retro-reflector on the rover would send modulated signals back to the lander through reflected light, enabling two-way data exchange.

Tests have already taken place, including field trials in Tenerife under night conditions similar to those on the Moon. These experiments helped validate how the rover could navigate and operate in low visibility.

“With the PHILIP project completed, we are one step closer to powering rovers with lasers to explore the dark parts of the Moon. We’re at the stage where prototyping and testing could begin, undertaken by follow-up ESA technology programmes,” stated Van Winnendael.

The project is still at the study stage, with prototyping expected next. If successful, this approach could open access to parts of the Moon that have remained unexplored until now.

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