Another trench in which conspiracy theorists love to barricade themselves, defying decades of scientific literature worldwide, concerns the authenticity of the rocks brought back to Earth by the crews of the Apollo missions. "Have you ever seen these phantom Moon rocks?" they often ask provocatively, implying that they are inaccessible samples hidden away in some military vault. Reality, once again, resoundingly refutes the paranoia: anyone can not only see them, but even touch some fragments put on display for the public in many aerospace museums around the world, like the famous "touchstone" at the Johnson Space Center in Texas, or the samples from Apollo 11 and Apollo 17 that the Nixon administration donated to more than 130 nations and various international scientific institutions.

APOLLO 11 SAMPLE LIST	APOLLO 17 SAMPLE LIST

For major certified scientific exhibitions, it is also possible to request display samples directly from NASA by contacting the relevant office at this website; to reach it, click on the logo below...

Of course, given the priceless value of the rocks, the office will ask you to certify that the event is official and of national or international importance , and of course to show proof of insurance coverage, which you will be strictly required to take out in order to import them. Moon rocks are extremely precious, not least because of what it costs to go and collect them in the remote deserts of another world...

Exhibition area at the Johnson Space Center in Houston. These display cases look directly onto the laboratories where most of the Moon rocks brought back by the Apollo astronauts are kept. Photo courtesy of JSC.	In the center of the Moon rock exhibition area at the Johnson Space Center in Houston there is a case where you can touch a fragment of Moon rock. Photo courtesy of JSC.

But to see a Moon rock in Italy , you don't need to import one from the United States. A fragment of lunar rock belonging to the historic Goodwill Moon Rock, found by geologist Harrison Schmitt in the lunar valley of Taurus-Littrow during the Apollo 17 mission, is on display at the Leonardo da Vinci National Museum of Science and Technology in Milan and can be seen every day during opening hours. It is a small stone of priceless value, perhaps the most important testimony of humanity's desire for exploration and of the scientific and technological challenge. It was donated in 1973 by US President Richard Nixon to the Presidency of the Italian Republic and then handed over to the Museum to be kept and displayed to the public. By studying it, scientists have been able to formulate hypotheses about the origin and nature of the Moon and open a window onto the very first moments of the Solar System.

But the overwhelming proof of the authenticity of the Moon rocks lies not in their museum displays, but in the extremely rigorous scrutiny to which these 382 kg of samples have been subjected by the entire international scientific community. The Apollo rocks have been sectioned and analyzed in thousands of geological laboratories (including university labs) around the globe. The most authoritative and politically weighty verdict of authenticity came from none other than the Academy of Sciences of the Soviet Union. Russian scientists, at the height of the Cold War, received several Apollo samples from their American colleagues and compared them with the grams of lunar soil collected and brought back to Earth fully automatically by their robotic probes of the Luna program. The chemical and isotopic results matched perfectly. Had NASA supplied fakes from Earth, the Soviets would have seized the opportunity of the century to expose and humiliate the United States before the whole world! Instead, they confirmed beyond any shadow of doubt the extraterrestrial origin of the samples.

The Soviet probes Luna 16, 20 and 24 managed to bring back to Earth, automatically, about 326 grams of lunar dust. The scientific comparison with the rocks brought back by the Apollo missions helped confirm their authenticity. Photo courtesy of ROSCOSMOS.The Soviet probes Luna 16, 20 and 24 could automatically bring back to Earth a few grams of lunar soil.Cornered by this cross-validation, deniers fall back on a second theory: they admit that the rocks are lunar, but claim that NASA secretly retrieved them using robotic probes, copying the Soviet method to avoid risking human lives. This hypothesis crumbles as soon as you look at the numbers and the engineering capabilities of the time. The three successful Soviet robotic probes (Luna 16, 20 and 24) managed to bring back to Earth, with immense effort and numerous failures, a total of just 326 grams of dust. The Apollo missions, thanks to the muscle power, judgment and tools of the astronauts, brought home over 382 kg of rocks of different sizes and geological types, including samples drilled from three meters deep with special hand-operated core drills. Moving and returning such a quantity of material to Earth would have required sending and recovering thousands of robotic probes equipped with artificial intelligence and robotic arms that we don't have even today, not to mention the need to launch in complete secrecy dozens of rockets toward the Moon, a logistically and financially impossible undertaking. When the secret probe hypothesis collapses, Moon-hoax theorists venture to the outer limits of fantasy geology, claiming that the samples were manufactured in secret government laboratories or that they are simply lunar meteorites collected in the ice of Antarctica. Both claims are so absurd that they would make even a geology student smile. Making a Moon rock in a laboratory on Earth is physically impossible. Chemical and physical analyses have revealed structural anomalies that bear witness to a formation that took place exclusively in the vacuum of space and in low gravity. The Apollo rocks, for example, are intrinsically and completely anhydrous: their crystal lattice contains no water at all, an element that, in the form of hydrated compounds, contaminates any rock formed on Earth. Mineralogists even discovered three minerals completely unknown on our planet, the most famous of which was named "Armalcolite" (from the initials of Neil Armstrong, Edwin Aldrin and Michael Collins). Moreover, the surface of these rocks is scarred by so-called "zap pits", that is, microscopic craters lined with melted glass. These micro-lesions are caused by the relentless impact of micrometeorites traveling at cosmic speeds (tens of km/s). On Earth, our dense atmosphere burns up these particles before they reach the ground; only on a celestial body without an atmospheric shield can a rock undergo this hypervelocity bombardment for billions of years.

A small piece of armalcolite brought back to Earth by the Apollo 11 astronauts, after whom it was named. It is entirely an extraterrestrial rock whose chemical composition differs from anything found on our planet. Photo courtesy of NASA.	A Moon rock collected during the Apollo missions. It clearly shows its extraterrestrial origin through numerous zap pits, tiny craters caused by the rock's continuous impacts with micrometeorites that have been falling freely onto the lunar surface for millennia. Photo courtesy of NASA.	A typical micrometeorite of the kind that regularly falls on the planets; on the Moon, these are mainly responsible for forming the fragmented, abrasive lunar regolith, as well as for the micro-cratering that constantly affects lunar rocks. It measures about 100 μm; micrometeorites are the fossil remains of the primordial dust that gave birth to the planets of the solar system. Photo courtesy of NASA.
A lunar "troctolite" brought back to Earth during the Apollo 16 mission. Photo courtesy of NASA.	Basalt rocks from the Sea of Tranquility, brought back to Earth by the Apollo 11 astronauts. Photo courtesy of NASA.	The Apollo Lunar Sample Return Container (ALSRC) of Apollo 11. This container made it possible to carry the rocks from the lunar surface to the laboratories on Earth under vacuum, without the slightest contamination by Earth's atmosphere. Photo courtesy of NASM Smithsonian.

As for the Antarctic meteorite theory, it trips up spectacularly over timing and atmospheric wear. The first real scientific expedition to systematically collect meteorites in Antarctica only began in 1976, years after the end of the Apollo program, and the first confirmed meteorite of lunar origin was not identified until 1982. But there is an even more insurmountable obstacle: when a lunar meteorite falls to Earth, the tremendous friction with our atmosphere melts its outer layer, creating a thick, unmistakable "fusion crust". Moreover, as soon as it touches the ground on Earth, the rock begins to absorb moisture and gases from our atmosphere. The Apollo samples, on the other hand, are pristine, without any fusion crust from atmospheric entry, because the astronauts sealed them in special vacuum aluminum containers right on the surface of the Moon, preserving their alien purity intact. The final word in the debate belongs to the isotopic signatures. The Apollo rocks are literally saturated with rare isotopes trapped within their mineral matrix, driven in by billions of years of direct exposure to the solar wind. We find huge concentrations of helium-3, an isotope of helium that is extremely rare on Earth but very abundant on the Moon, together with specific trapped isotopes of neon and argon. No furnace on Earth, no military chemical laboratory and no meteorite that fell and was contaminated in the Antarctic ice could ever fake or reproduce such a perfect solar atomic signature. The analysis of these 382 kg of cosmic history has not only dismantled the conspiracy theories, but has revolutionized our understanding of the cosmos. By studying the abundance of certain elements (such as calcium, aluminum and titanium) and the shortage of volatile elements, scientists were able to formulate and validate the Giant Impact Hypothesis for the origin of the Moon...

Today we know that our satellite is the child of a primordial catastrophe: a Mars-sized planetoid, named Theia, crashed into the proto-Earth billions of years ago. The material ejected by the impact formed a ring of glowing debris that, clumping together in the vacuum, gave birth to the Moon. If flesh-and-blood humans had not traveled 384,000 km, choosing the right rocks with a critical, trained eye and sealing them to protect them from the atmosphere of their home world, this extraordinary, violent genesis of our planetary system would have remained forever shrouded in mystery.