What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Some links on this page are affiliate links: if you buy through them we may earn a commission, at no extra cost to you.
The “strange” thing in the Moon’s South Pole–Aitken basin is not a hidden object or cavern. It is a broad patch of thorium-rich lunar material that a 2025 study says may include remnants of the Moon’s ancient magma ocean, excavated by the impact that formed the basin. NASA is not about to drill into a buried deposit: future missions to the lunar south-polar region could collect surface rocks and soil that help test the idea.
What is the South Pole–Aitken basin?
The South Pole–Aitken basin is the Moon’s largest known impact feature. It stretches across the far side toward the south pole and measures more than 1,550 miles (about 2,500 kilometers) across. NASA describes it as about 6 miles (10 kilometers) deep on average, though its precise boundaries and depth depend on how the basin is defined. It formed more than 4 billion years ago, during the Moon’s earliest history. NASA’s overview of the South Pole–Aitken basin explains its scale and scientific importance.
It is often called the Moon’s biggest crater in popular coverage, but “impact basin” is more precise. A basin is a vast, complex impact structure, not a simple bowl-shaped crater.
Recommended Free Tools
What is the unusual material?
A study published in Nature on October 8, 2025, focuses on a regional thorium anomaly: orbital compositional maps show elevated thorium in ejecta southwest of the basin. Ejecta is material thrown outward by an impact. The measurements are remote-sensing estimates, not readings from a newly collected rock. The study reports the following averages for mapped regions:
#1 Best Overall
- Realistic Lunar Detail with Cratered Surface — A faithful recreation of the Moon’s rugged topography, this design shows lunar craters, valleys, and maria as seen from Earth’s orbit.
- Solar-Powered Motion – No Wires or Batteries — This MOVA Globe rotates continuously using only ambient light and the Earth’s magnetic field. No fuss, no noise, no cables.
- Compact Display Piece with Stunning Presence — At 4.5 inches across, it fits perfectly on desks, nightstands, or bookshelves. A small globe that sparks big conversation.
- Premium Build with Seamless Movement — A fluid-suspended inner globe rotates within a clear acrylic outer shell, offering a smooth, almost magical visual experience.
- Inspire Curiosity and Wonder — Perfect for stargazers, space buffs, students, and science enthusiasts. A gift that celebrates Earth’s constant lunar companion.
| Mapped region | Average thorium |
|---|---|
| Southwestern ejecta | 1.79 ± 0.03 parts per million |
| Typical far-side highlands comparison area | 0.95 ± 0.02 parts per million |
| Eastern comparison area | 1.17 ± 0.03 parts per million |
| Basin center | 2.78 ± 0.05 parts per million |
Thorium matters here as a geological tracer, not because the map identifies a mineable ore body. It is an incompatible element: as minerals crystallize from molten rock, thorium tends to remain in the liquid rather than enter many early-forming minerals. In lunar geology, thorium is associated with potassium and rare-earth elements in material known as KREEP.
Why the study argues the impact came from the north
The study’s proposed explanation combines the basin’s shape with the distribution of its ejecta. The basin narrows toward the south, and giant impact basins tend to taper in the direction of travel. The authors argue that this geometry, together with the southwestern thorium-rich ejecta and the lack of a comparable northern thorium-rich blanket, fits an impactor moving southward.
That interpretation differs from earlier ideas that favored a northward trajectory, based in part on topography, crustal thickness and possible impactor-related magnetic anomalies. The paper says its taper analysis weighs against a northward direction at approximately the 2-sigma level. That is evidence for the authors’ preferred interpretation, not direct observation of an impact that happened billions of years ago; the trajectory remains an inference from the basin’s shape and other mapped properties.
Rank #2
- It is held by a free mount base for easy viewing
- Made in USA
- Over 3000 place names
How could the impact reveal material from the Moon’s molten beginning?
Early in its history, the Moon is thought to have had a global magma ocean. As it cooled, minerals crystallized and separated according to their chemistry and density. Some elements, including thorium, potassium and rare-earth elements, became concentrated in the final liquid left behind. That late-stage material is part of the context for KREEP.
- The early Moon’s magma ocean began to crystallize, concentrating some elements in residual liquid.
- The South Pole–Aitken impact excavated material from deep beneath the surface and hurled it outward.
- Some ejecta may have included deep-crustal or mantle material and remnants related to the magma ocean’s final liquids.
- Billions of years of later impacts redistributed and mixed the ejecta, but some relevant rocks or soil may still be accessible near the basin’s southern rim.
The 2025 paper models residual magma-ocean liquid as persisting beneath the basin’s southwestern part when the impact occurred, but not beneath its northeastern part. That is a model-based interpretation of the thorium pattern and impact dynamics. It does not demonstrate that an intact, pristine reservoir lies just below the surface or that a particular sample site will contain it.
Is NASA about to dig into the basin?
No dedicated NASA excavation or drilling operation in the basin is established by the evidence behind this headline. NASA’s Artemis science planning concerns exploration of the lunar south-polar region, which overlaps the basin’s southern rim and ejecta. The agency identifies the basin as an important target for future sample collection and research, and its Artemis science overview describes broader lunar exploration goals.
Rank #3
- Great way for students to learn about the moon and the Apollo 11 mission
- This special edition National Geographic Moon Globe has a rechargeable LED device with long lasting LED bulbs
- 750 Moon topographic locations
- Includes impact craters, mountain ranges, highlands, seas, rays
The relevant possibility is surface sampling, not necessarily deep drilling. A rover or crew could collect rocks, regolith (loose surface material) and breccias—rocks made from fragments fused together by impacts. A proposed NASA Endurance South Pole–Aitken traverse and sample-return concept illustrates how a rover could investigate and gather basin material; a concept is not confirmation that NASA will fly that mission.
Do these 3 things before closing this tab:
1Clear out junk files and repair common Windows errors2Scan for outdated or missing drivers - takes under a minute3Repair Windows errors before they cause bigger problemsThe 2025 study notes that proposed Artemis landing areas lie on the basin’s downrange rim and within thorium-rich ejecta. That makes future samples potentially relevant, but it does not establish that a specific Artemis crew will visit the anomaly. Mission sequences, landing sites and scientific targets can change as plans develop.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What could a sample tell scientists?
Orbital measurements can map broad chemical patterns, but they cannot by themselves establish the precise minerals, ages, depths or mixing histories of every deposit. Laboratory study of returned samples could test whether the southwestern thorium signal corresponds to the material the model predicts. Scientists could examine:
Rank #4
- A Unique Night Light for Kids - Moon lamp with the diameter is 4.8 INCH, made with 3D printing technology, realistic full moon shape, the surface of the moon lamp is very close to the lunar moon, novelty and charming; Create a peaceful environment in your kids' rooms and help them enter a blissful slumber with the bright moon light.
- Moon Night Light with 16 RGB Colors - The 16 colors can flash or fade or strobe, dreamlike and creative decorative lights, perfect for your nursery room or children bedroom; can adjust brightness to turn this moon lamp into a soft kids' night light, provide children with a comfortable sleeping environment.
- Moon Light with Remote & Touch Control Model - Use the remote control to change the color or also the brightness of the color, very convenient for you to choose your perfect color. You can use the timer on the remote control to fix the moon light light for 15/30/45/60 mins. This moon glowing lights (dimming & flash) perfect for romantic dinner or an anniversary.
- Moon Lamp with the Build-in Rechargeable Battery - No line hanging around, you can hold the moon light on your hand; Designed with USB charging port, and you can charge this moon globe on any USB devices, like computer/power bank or USB adapter etc.
- A comfortable night light, perfect decoration for bedroom, courtyard, dinner table, parties, cafe and outdoor decoration; A romantic and mysterious gift for friends, kids and family on birthday, wedding, anniversary, Easter, Thanksgiving Day and Christmas.
- Radiometric ages of impact melt and ejecta, helping constrain when the basin formed.
- Thorium, titanium, potassium and rare-earth-element abundances, to characterize KREEP-related material.
- Minerals and isotopes that bear on the composition and crystallization of the early Moon.
- Shock features and fragment mixing, which can show how impact ejecta was formed and later reworked.
The basin is especially valuable because lunar rocks preserve a record of early events that is difficult to recover from Earth, where erosion and plate tectonics have extensively reshaped the surface. NASA’s Artemis science goals place south-polar exploration within the broader effort to investigate the Moon’s history and geology.
What remains uncertain?
The central observation is a thorium pattern mapped from orbit; its geological origin is still an interpretation to be tested. Later impacts may have mixed basin ejecta with local rocks and material from elsewhere, so an accessible sample need not be pristine or representative of the deep source. The basin’s exact age also remains debated: the study discusses estimates around 4.25 billion years and around 4.33 billion years or older, depending on the method. “More than 4 billion years old” is the safer broad description.
Crashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minutePC Slower Than It Used to Be?
A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11The study’s proposed southward trajectory and magma-ocean connection are scientifically testable hypotheses, not proof of a hidden structure, a commercially valuable deposit, or a discrete underground cache. Samples from carefully chosen locations would be needed to determine how much of the mapped signal comes from excavated deep material, pre-existing terrain, or later mixing.
Why the basin may help explain the Moon’s two faces
The lunar near side and far side differ in their crust and volcanic history, and KREEP-related materials are strongly associated with parts of the near side. Mapping where thorium-rich material occurs around the South Pole–Aitken basin, then comparing it with physical samples, could help scientists test ideas about how those chemical patterns formed and whether the basin excavated or redistributed material from the Moon’s interior. The result may sharpen explanations of the Moon’s asymmetry; it does not by itself resolve the question.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
