Japan Launches SLIM Moon Lander and XRISM X-Ray Telescope

SLIM moon lander
H2A rocket blasts off from the launch pad at Tanegashima Space Center in Kagoshima, southern Japan Thursday, Sept. 7, 2023. Credit: Kyodo News via AP

In a remarkable display of scientific ambition and technological prowess, Japan recently launched two pioneering missions into space on a single rocket, marking a significant milestone in the country’s space exploration efforts. On September 6, 2023, the Smart Lander for Investigating Moon (SLIM) and the X-Ray Imaging and Spectroscopy Mission (XRISM) embarked on a journey to explore the moon and the deepest mysteries of the universe. This blog post dives into the details of these exciting missions, highlighting their significance and the cutting-edge technology they bring to the forefront of space exploration.

Japan’s Dual Mission: A Glimpse into the Future

The X-ray Imaging and Spectroscopy Mission (XRISM) and the Smart Lander for Investigating Moon (SLIM) onboard the H-IIA Launch Vehicle No. 47 (H-IIA F47) (Image: Jaxa)

The Smart Lander for Investigating Moon (SLIM):

The SLIM lunar probe, often dubbed “Moon Sniper” by the Japan Aerospace Exploration Agency (JAXA), promises to achieve a groundbreaking feat – a precision landing on the moon. Measuring a modest 7.9 feet in height, 8.8 feet in length, and 5.6 feet in width, SLIM may be small, but its impact could be monumental.

It is a small, lightweight spacecraft that is designed to make a precise landing on the moon. It is equipped with a variety of sensors and cameras that will allow it to study the lunar surface in detail. The SLIM lander is expected to reach the moon in 2024 and will then spend several months orbiting the moon before attempting a landing.

Why SLIM Matters:

Paving the Way for Future Lunar Missions: If successful, SLIM will mark Japan’s fifth soft landing on the Moon, solidifying their expertise in lunar exploration. This success will boost confidence and pave the way for more ambitious lunar missions in the future.

Pinpoint Landing Technology: SLIM’s primary objective is to test and demonstrate pinpoint landing technology. This technology allows for precise landings on designated locations, even in resource-scarce environments like the Moon. This capability will be crucial for future missions that aim to explore and utilize specific areas of the lunar surface

Revolutionizing Space Exploration: By mastering pinpoint landing technology, SLIM has the potential to revolutionize space exploration. Precise landings enable more targeted exploration, resource extraction, and infrastructure development on other planets and celestial bodies.

Expanding Lunar Knowledge: SLIM’s scientific instruments will gather valuable data about the Moon’s surface composition, magnetic field, and gravitational field. This data will enhance our understanding of the Moon’s geological history and evolution.

SLIM Moon Lander: Potential Applications

An artist’s concept of SLIM on the surface of the moon.Credit…JAXA

In addition to its primary goal of demonstrating precision landing capabilities on the Moon, SLIM also has the potential to be used for a variety of other applications, including:

Scientific Investigations: SLIM’s scientific instruments will conduct a variety of investigations, including measuring the Moon’s gravitational and magnetic fields, collecting lunar regolith samples, and performing X-ray fluorescence mapping. This data will enhance our understanding of the Moon’s geological history, evolution, and composition.

Infrastructure Development: SLIM’s pinpoint landing technology will facilitate the deployment of future lunar infrastructure, such as permanent lunar bases, research stations, and resource extraction facilities. Precise landings will enable the safe and efficient construction of these structures.

Resource Exploration and Utilization: SLIM’s ability to land precisely on designated locations will enable targeted resource exploration on the Moon. Its scientific instruments can identify and characterize potential resources such as water ice, rare earth elements, and helium-3. This information will be crucial for future missions that aim to extract and utilize these resources for in-situ resource utilization (ISRU).

The XRISM X-ray Telescope:

An artist’s concept of the bus-sized XRISM space telescope.Credit…JAXA

While SLIM is set to make history on the lunar surface, XRISM, the X-ray Imaging and Spectroscopy Mission, takes on a different but equally crucial role. This collaboration between JAXA, NASA, and the European Space Agency (ESA) seeks to unlock the mysteries of the universe by studying high-energy X-ray light.

The XRISM telescope is a large, powerful telescope that is designed to study some of the most energetic phenomena in the universe, such as black holes, neutron stars, and galaxy clusters. The XRISM telescope is already in orbit around Earth and will begin its scientific observations in 2024.

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Why XRISM Matters:

Unveiling the Mysteries of Black Holes: XRISM’s high-resolution mirror will enable it to observe black holes at unprecedented energies, shedding light on their inner workings. It will help scientists to study the accretion disks around black holes, the formation of jets, and the physics of gravitational waves.

Exploring the Extremes of Active Galactic Nuclei (AGNs): XRISM will probe the centers of active galaxies, where supermassive black holes reside. It will provide unprecedented insights into the jets emitted by AGNs, the distribution of matter around them, and the role of these powerful sources in the universe.

Contributing to Our Understanding of Dark Matter and Dark Energy: XRISM’s observations of X-ray emissions from distant galaxies will provide valuable data for constraining the properties of dark matter and dark energy, the mysterious substances that make up most of the universe.

Unveiling the Cosmic X-ray Background: XRISM will study the cosmic X-ray background, a faint glow of X-rays that permeates the universe. This will help scientists to understand the formation and evolution of galaxies and the history of star formation

Graphic on Japan's Smart Lander
Graphic on Japan’s Smart Lander for Investigating Moon (SLIM), or ‘Moon Sniper’, which aims to land within 100 meters of a specific lunar target.

XRISM X-Ray Telescope: Potential Discoveries

XRISM’s high-resolution X-ray spectrometer is expected to make significant contributions to our understanding of a wide range of astronomical phenomena, including:

The Inner Workings of Black Holes: XRISM’s unprecedented sensitivity will allow it to probe the inner regions of black holes, where matter falls in at incredible speeds. This could reveal new insights into the formation of jets, the behavior of matter in extreme gravitational fields, and the nature of black hole singularities.

The Properties of Neutron Stars: XRISM’s high-resolution images of neutron stars could uncover new details about their surface properties, magnetic fields, and internal structure. This could provide clues about the equation of state of matter at ultra-high densities and shed light on the formation mechanisms of these enigmatic objects.

The Nature of Active Galactic Nuclei (AGNs): XRISM’s observations of AGNs could reveal the mechanisms responsible for their enormous energy output and the formation of their jets. This could provide a deeper understanding of the role of AGNs in galaxy formation and evolution.

The Evolution of the Early Universe: XRISM could study distant galaxies and clusters of galaxies to probe the formation and evolution of the early universe. This could provide insights into the cosmic X-ray background, the distribution of dark matter and dark energy, and the early stages of galaxy formation.

The Search for New X-ray Sources: XRISM’s wide field of view and high sensitivity could lead to the discovery of new and unexpected X-ray sources, such as black holes hidden in the cores of galaxies, neutron stars with unusual properties, and transient X-ray events.

The Significance of Japan’s Doubleheader Launch:

Japan’s doubleheader launch in September 2023 marked a pivotal moment for the country’s space exploration program, showcasing its technological prowess and commitment to scientific advancement. The simultaneous launch of the SLIM (Smart Lander for Investigating Moon) lunar lander and the XRISM (X-ray Imaging and Spectroscopy Mission) X-ray telescope demonstrated Japan’s ability to execute complex missions and leverage its expertise in both lunar exploration and X-ray astronomy.

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SLIM: Paving the Way for Future Lunar Exploration

The SLIM lander, Japan’s fifth successful lunar landing, marked a significant step forward in lunar exploration capabilities. Its pinpoint landing technology, capable of touchdown on precise locations even on the challenging lunar terrain, has the potential to revolutionize future moon missions. This precision will enable scientists and engineers to target specific areas of interest for exploration and resource utilization.

Moreover, SLIM’s scientific instruments, designed to gather data on the Moon’s gravitational and magnetic fields, lunar regolith composition, and X-ray fluorescence mapping, will significantly enhance our understanding of the Moon’s geological history and potential resource abundance. This data will lay the groundwork for more informed decisions regarding future lunar missions, including the establishment of permanent lunar bases and resource extraction operations.

XRISM: Unveiling the Mysteries of the Cosmos

The XRISM X-ray telescope, launched concurrently with SLIM, is a cutting-edge instrument poised to make groundbreaking discoveries in the field of X-ray astronomy. Its high-resolution mirror and sensitive detectors will enable it to peer into the depths of the cosmos, observing objects like black holes, neutron stars, and active galactic nuclei (AGNs) with unprecedented clarity. These observations could shed light on the inner workings of these extreme objects, their formation mechanisms, and their role in the evolution of the universe.

What’s Next for SLIM and XRISM:

SLIM is expected to reach lunar orbit in 2024

After successfully reaching lunar orbit in 2024, SLIM’s primary objective will be to execute a precise landing within Shioli Crater, a region of the Moon believed to harbor valuable resources such as water ice. This targeted landing will serve as a crucial demonstration of SLIM’s pinpoint landing technology, paving the way for future missions to resource-scarce planets or asteroids.

Upon landing on the lunar surface, will deploy its scientific instruments to conduct a comprehensive investigation. tilizing gravitational and magnetic field measurements, likewise focusing on regolith sampling and X-ray fluorescence mapping, Chang’e-7 aims to not only unveil insights into the Moon’s internal structure but also provide valuable information about the composition and distribution of resources in Shioli Crater. Furthermore, the gathered data will beyond merely enhance our understanding of lunar geology but will also play a crucial role in shaping and informing future missions focused on resource utilization on the Moon. In fact, the potential extraction and utilization of resources, particularly water ice, could fundamentally transform space exploration by enabling the establishment of permanent lunar bases and paving the way for forthcoming missions to Mars and beyond.

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XRISM is already in Earth orbit, poised to provide groundbreaking insights into the universe’s most energetic phenomena. Now, poised to begin its primary mission, XRISM will embark on a journey of cosmic discovery, providing unprecedented insights into the universe’s most energetic phenomena. Its high-resolution mirror and sensitive detectors will enable XRISM to observe celestial objects emitting X-rays with unprecedented clarity. This will allow scientists to delve into the mysteries of black holes, neutron stars, and active galactic nuclei (AGNs).

It’s observations of black holes will shed light on their accretion disks, jet formation, and the nature of gravitational waves. It will probe neutron stars in unprecedented detail, revealing their surface temperatures, magnetic fields, and internal structure. And it will study AGNs with unprecedented clarity, providing insights into the mechanisms responsible for their enormous energy output and the formation of their jets.


Japan’s launch of the SLIM moon lander and the XRISM X-ray telescope represents a significant achievement in space exploration. These missions symbolize Japan’s unwavering commitment to pushing the boundaries of scientific knowledge and technological innovation. As SLIM embarks on its historic lunar landing attempt and XRISM begins its cosmic observations, the world awaits the discoveries and advancements that these missions will bring to humanity’s understanding of our universe. Stay tuned for more updates on these extraordinary journeys into space.

Blastoff! Japan launches SLIM moon lander, X-ray telescope


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