For the first time in human history, the far side of the Moon – often called the “dark side” – will be directly observed by the human eye. NASA’s Artemis II mission, slated for launch no earlier than March 6, 2026, will send a crew of four astronauts on a 10-day flight around the Moon, offering unprecedented views of this largely unseen lunar landscape. This mission marks a pivotal moment in lunar exploration, building on the success of the uncrewed Artemis I mission in 2022 and paving the way for future crewed landings.
The Artemis II mission isn’t just about seeing the unseen; it’s a critical test of the Space Launch System (SLS) rocket and Orion spacecraft, essential for long-duration space travel. The crew will venture approximately 6,400 to 9,600 kilometers from the lunar surface, providing a vantage point that will allow them to observe the entire lunar disc, including the permanently shadowed regions at the poles. This close proximity will enable detailed observations that have previously been impossible to achieve. Understanding the composition and characteristics of the far side is crucial to unlocking the Moon’s history and potential resources.
Unveiling the Moon’s Hidden Side
Even as robotic missions have provided images of the far side, the Artemis II crew will offer real-time, human observation and analysis. During the Apollo missions, the capsules’ orbits didn’t allow astronauts to view the entire far side directly. The far side differs significantly from the near side, possessing a thicker crust, higher elevations, and fewer volcanic features. This asymmetry remains one of the biggest mysteries in lunar science, according to Arizona University’s Lunar and Planetary Laboratory professor Jeff Andrews-Hanna, who stated, “The Moon is almost asymmetric in every way, and we don’t know why. This global asymmetry is one of the biggest mysteries in lunar evolution.”
Water Ice and the Lunar Interior
Recent analysis of Apollo samples, some previously unexamined, and samples returned by robotic missions, have revealed the presence of water ice trapped within seemingly dry rocks. This discovery has significant implications for future lunar missions and the potential for establishing a sustainable presence on the Moon. The Artemis program aims to study different lunar regions, providing a more comprehensive understanding of the Moon’s surface and composition, including the distribution of water ice and how it has evolved over time. The presence of water could be a vital resource for future astronauts, providing drinking water, oxygen, and even rocket fuel.
The Giant Impact Hypothesis and the Moon’s Origins
The prevailing theory regarding the Moon’s formation is the Giant Impact Hypothesis, which posits that the Moon formed from debris ejected after a Mars-sized object collided with Earth. Evidence supporting this theory includes the similarity in isotopic composition between Apollo rocks and Earth’s mantle. Noah Petro, of NASA Goddard Space Flight Center and lead scientist for Artemis III, describes the Moon as “Earth’s eighth continent,” emphasizing that studying the Moon provides insights into Earth’s own history and evolution. He added, “When we study the Moon, we’re actually studying an extension of Earth.” The presence of anorthosite, a rare magmatic rock found in Apollo samples, suggests the Moon once had a global magma ocean.
The South Pole-Aitken Basin: A Window into the Past
A key target for future exploration is the South Pole-Aitken Basin, a massive impact crater on the far side of the Moon. Approximately 2,500 kilometers in diameter and over 8 kilometers deep, it’s believed to be the oldest and largest impact structure on the Moon. Determining its age, Petro explains, “would be like finding a Rosetta Stone for the early history of the solar system.” The basin’s unique composition and potential exposure of ancient lunar material make it a prime location for understanding the Moon’s early evolution.
Human Eyes in the Loop
During the Artemis II mission, the crew – consisting of NASA astronauts Reid Wiseman, Victor Glover, and Christina Koch, and Canadian Space Agency astronaut Jeremy Hansen – will spend approximately three hours observing the far side of the Moon. They have undergone extensive training, including geological fieldwork in Iceland, to prepare them for identifying and documenting key features. Their observations, relayed in real-time to the Johnson Space Center in Houston, will complement data collected by onboard instruments. Petro emphasizes the value of human observation, stating, “A trained pair of eyes is the greatest experiment we can send to the universe, because it works with curiosity.”
Looking Ahead: Artemis III and Beyond
While Artemis II will provide crucial observational data, the Artemis III mission, planned for around 2028, will mark the return of astronauts to the lunar surface. Future missions, Artemis III and IV, will focus on the Moon’s south pole, conducting observations, experiments, and sample collection. Artemis V is planned to retrieve frozen samples from the lunar surface. Currently, only about 5% of the Moon’s surface has been sampled by Apollo missions and robotic probes. The Artemis program represents a strategic step towards establishing a long-term human presence on the Moon and utilizing its resources, ultimately paving the way for human missions to Mars.
The Artemis program is viewed as a stepping stone to Mars, with technologies and infrastructure developed on the Moon intended to support future crewed missions to the Red Planet. As Petro notes, “When we think about Earth, the Moon, and Mars together, we have a powerful framework for understanding how planets work. The Moon is the best place to start exploring.”
The next major milestone for the Artemis II mission is the rollback of the rocket and spacecraft, as NASA addresses an issue with the upper stage, according to recent updates. Further updates on the mission’s progress and launch date can be found on NASA’s Artemis II website.
What questions do you have about the Artemis II mission and the future of lunar exploration? Share your thoughts in the comments below.
