August 19, 2026 — A small spacecraft could one day sweep past the Moon, a near-Earth asteroid, and Mars’s moon Phobos while using a single laser-based instrument to search for water, minerals, and other valuable materials. The ambitious concept, led by SETI Institute research scientist Pablo Sobron, is being studied through NASA’s Innovative Advanced Concepts (NIAC) program. Known as Interworld Slingshot Resource Surveys, the proposal aims to determine whether Raman spectroscopy can identify the chemical makeup of distant planetary surfaces without requiring a spacecraft to land, drill, or return samples to Earth.
The idea addresses a fundamental obstacle facing future space mining and long-duration exploration: before anyone can extract resources beyond Earth, mission planners must know what is present, how much exists, and where it is concentrated. On Earth, mining companies spend years surveying landscapes, collecting samples, drilling test wells, and building geological models before committing to extraction. Space missions face the same need for reliable information, but every measurement is more difficult and expensive. A failed landing, an empty drilling site, or an incorrectly selected target could cost years of work and hundreds of millions of dollars.
The proposed mission would use a compact spacecraft traveling along a carefully designed trajectory. Rather than orbiting only one world, it could make observations while circling the Moon and during rapid encounters with a near-Earth asteroid and Phobos. The spacecraft would carry one remote-sensing instrument based on Raman spectroscopy, a technique that reveals the molecular structure of materials by analyzing how they interact with laser light. By using gravity-assisted paths and efficient propulsion, the mission could potentially survey multiple destinations over five to eight years, turning a single spacecraft into a mobile reconnaissance platform for planetary resources.
Raman spectroscopy works by illuminating a material with a laser and measuring the light scattered back from its surface. Most of the returned photons retain the same energy as the incoming laser light, a process known as elastic or Rayleigh scattering. A very small fraction, however, exchanges energy with molecular vibrations inside the material. These shifted photons form a Raman spectrum, producing peaks associated with specific chemical bonds and crystal structures. Because different minerals and compounds generate distinctive spectral patterns, the method can reveal composition rather than simply showing how bright or dark a surface appears.
Raman instruments are already proving their value in planetary exploration. NASA’s Perseverance rover carries Raman capabilities in its SHERLOC and SuperCam systems, allowing scientists to examine rocks and dust directly on Mars. Japan’s Martian Moons eXploration mission is also expected to use Raman spectroscopy to investigate Phobos. On a rover or lander, the instrument can operate at close range, sending a laser onto a small target and collecting a relatively strong signal. Interworld Slingshot Resource Surveys would attempt something far more demanding: making useful Raman measurements from tens of kilometers away while moving through space at high speed.
That distance creates a severe photon-counting problem. Raman scattering is extraordinarily faint, with estimates suggesting that only about one photon in 10 trillion may undergo the relevant energy-changing interaction. Sobron’s earlier long-distance Raman experiments reached approximately 120 meters, but the proposed mission would extend the measurement range to roughly 30–50 kilometers. At those distances, the laser beam spreads, the illuminated area becomes larger, and the already weak Raman signal is diluted before it reaches the detector. The spacecraft must therefore deliver enough laser energy to a target approximately a meter across while collecting and distinguishing an extremely small number of returning photons.
The project’s initial NIAC study will examine whether the physics and engineering can support those requirements. Researchers will calculate the photon budget, estimate the amount of Raman light generated by different minerals, and determine how efficiently a telescope and detector could capture the signal. They will also study sensitive single-photon detectors, compact lasers, optical filters capable of rejecting overwhelming background light, and pointing systems precise enough to keep the instrument focused on a small surface location during a fast flyby. A small angular error could move the beam away from the intended target, while sunlight reflected from the surface could overwhelm the Raman signature.
The mission would not initially attempt to produce a complete economic map of extraterrestrial resources. Its more immediate purpose would be to identify locations that deserve closer investigation. A Raman measurement might reveal hydrated minerals, water-bearing compounds, metals, silicates, or other materials associated with future exploration. The data could help distinguish a surface that merely appears promising in ordinary images from one whose chemistry supports a realistic resource assessment. In that sense, the spacecraft would place an “X” on a planetary map, directing later landers, rovers, or crewed missions toward targets with the greatest scientific or operational potential.
Remote resource scouting could also change how spacecraft are designed. If explorers know that water or oxygen-bearing minerals are available at a particular location, they may be able to reduce the amount of propellant, life-support material, or industrial equipment launched from Earth. Water is especially important because it can support astronauts, provide radiation shielding, and potentially be separated into hydrogen and oxygen propellants. On asteroids, accurate reconnaissance could reduce the risk of landing on terrain with little useful material. On the Moon or Mars, composition maps could help planners position bases, extraction systems, and scientific instruments more efficiently.
The study brings together researchers from the SETI Institute, NASA’s Goddard Space Flight Center, NASA’s Ames Research Center, and the space company OffWorld. The team includes Jane Lee, Xiaoli Sun, Alan Cassell, Rachel Ticknor, Dylan Morrison, Pablo Sobron, and Jim Keravala. The researchers emphasize that the Phase I effort may show that some elements of the concept are not yet practical. Even a negative result would establish limits for long-distance Raman sensing and identify which components require major advances. If the approach succeeds, however, it could provide a new form of planetary reconnaissance—one capable of surveying multiple worlds with a single instrument before humans or expensive mining systems commit to a landing.
Subject of Research: Remote Raman spectroscopy for surveying lunar, asteroid, and Phobos resources from orbit and during spacecraft flybys.
Article Title: A Tiny Spacecraft Could Scan the Moon, an Asteroid, and Phobos for Resources Using One Laser Instrument
News Publication Date: August 19, 2026
Web References: https://www.seti.org/people/pablo-sobron/ ; https://mediasvc.eurekalert.org/Api/v1/Multimedia/f9b5aa15-0ffd-4233-b139-b583107b0ec4/Rendition/low-res/Content/Public
References: SETI Institute; NASA Innovative Advanced Concepts (NIAC); NASA Perseverance rover mission; Japan’s Martian Moons eXploration mission.
Image Credits: Pablo Sobron/SETI Institute
Keywords
Raman spectroscopy, space exploration, space resources, lunar exploration, asteroids, Phobos, planetary science, remote sensing, NASA NIAC, SETI Institute, space mining, spacecraft technology
