The Ossuary Moon

We’ve all heard tales of the moon being made of cheese, but what if it were made of bones? Bone fragments. Bone dust. Partial skeletons from animals we have no name for, no knowledge of. What if the moon were made of bones? I confess that before the expedition I would have regarded such a question as the childish fancy of an unstable mind, and perhaps it would have been better for me had I remained ignorant. There are truths which do not enlighten mankind but diminish it, truths so vast and malignant that the human intellect recoils from them as flesh recoils from flame. I know this now. I know it because I have walked upon the moon, placed my hands upon its ancient white soil, and discovered that the pale dust clinging to my gloves was not dust at all.

There were seven of us aboard the Orpheus when we descended into the crater designated Marius-17, a nameless wound upon the far side of the moon where orbital surveys had detected a cavern extending farther beneath the surface than our instruments could measure. The mission had been presented publicly as a geological expedition. We were to collect samples, study the unusual formations, and determine whether the cavern had been created by ancient volcanic activity. Only after we entered lunar orbit did Commander Vale open the sealed instructions and tell us the truth. An unmanned probe had entered Marius-17 eleven months earlier. Before communication was lost, it transmitted seventeen photographs. I saw those photographs only once, yet they return whenever I close my eyes. They showed structures resembling ribs protruding from the cavern walls, vertebrae embedded within cliffs, and enormous curved objects that could only be described as teeth. The final image showed something stranger still: a skeleton approximately nine meters long, possessing four arms, a narrow torso, and a skull containing a circular arrangement of empty sockets. Around its neck hung what appeared unmistakably to be a necklace.

That necklace changed everything. Bones might conceivably have been dismissed as unusual mineral formations. Jewelry could not.

We landed twelve kilometers from the cavern entrance. The moon appeared exactly as it always had in photographs—silent, colorless, dead—but within an hour of leaving the lander, Dr. Ishikawa discovered the first fragment. She lifted it from the dust with forceps and stared at it through her helmet visor. It was small, perhaps the length of a finger, and perfectly white. Even before the laboratory analysis, we knew what it was. The fragment possessed the unmistakable porous architecture of bone. Later tests confirmed calcium phosphate, collagen remnants, and microscopic structures analogous to osteocytes. Yet its isotopic composition was unlike that of any organism known on Earth. Whatever creature had possessed that bone had not evolved beneath our sun.

After that discovery, we began seeing bones everywhere.

The moon was littered with them.

Fragments protruded from the regolith like broken shells upon an endless beach. Some were recognizable in shape—ribs, jaws, vertebrae, claws—while others belonged to anatomies for which human language possesses no adequate vocabulary. We discovered a skull no larger than my thumbnail with twenty-eight perfectly symmetrical eye sockets. We found a femur nearly thirty meters long. We found something resembling a spinal column that divided repeatedly into smaller spines until it resembled the roots of a tree. Dr. Mercer uncovered the remains of a creature whose skeleton formed a perfect sphere. Another specimen possessed hundreds of delicate limbs radiating outward from a central jaw. There were no duplicates. No two creatures appeared to belong to the same species.

That should have frightened us more than it did.

Curiosity is perhaps mankind's most beautiful defect. Faced with evidence that should have sent us fleeing toward Earth, we continued downward.

The entrance to Marius-17 descended at an angle into absolute darkness. Our lamps revealed walls the color of old ivory. At first I believed the resemblance coincidental, but Mercer stopped after only fifty meters and scraped the wall with a geological hammer. A pale powder drifted downward in the weak gravity. He collected it, placed it beneath the portable microscope, and said nothing for several minutes.

Then he whispered, “This isn't rock.”

The walls were compressed bone.

Not merely fragments trapped within stone. Bone upon bone upon bone, pulverized and compacted beneath pressures that should not have existed on such a small celestial body. Entire geological strata consisted of skeletal remains. Some layers were composed of creatures no larger than insects. Others contained fragments belonging to organisms of unimaginable dimensions. We passed beneath an arch that we initially mistook for a mineral formation until Ishikawa identified it as part of a rib.

According to the laser rangefinder, the exposed portion measured more than two kilometers.

Something with a rib two kilometers long had once lived.

None of us spoke after that.

At twelve hundred meters below the surface, we discovered the carvings.

They covered the walls in repeating spirals, circles, and branching geometries that seemed to change whenever viewed from the corner of the eye. I cannot explain them adequately. The shapes violated something fundamental in perception. Lines appeared to intersect without touching. Angles seemed simultaneously acute and obtuse. When I attempted to sketch one in my notebook, I found that my hand had drawn an entirely different symbol than the one before me. Mercer stared at the markings for nearly an hour before suffering a seizure. When he recovered, he insisted they were not writing.

“They're numbers,” he said.

We asked what they counted.

He refused to answer.

Later that night, inside the temporary habitat, I awoke to find Mercer sitting beside the airlock without his helmet. His eyes were open, and blood had dried beneath his nose.

“They counted the dead,” he whispered.

Then he began laughing.

The following morning, Mercer was gone.

His suit remained inside the habitat.

We found his footprints leading away from camp.

Bare footprints.

They crossed the lunar dust for nearly three hundred meters before disappearing at the edge of the cavern.

We should have abandoned the mission then. Commander Vale ordered us to return to the lander, but before we could leave, Ishikawa discovered the chamber.

It lay almost three kilometers beneath the surface.

No natural process had created it.

The chamber was circular and vast enough to contain a city. Our lamps could not illuminate the ceiling. The floor was covered with skeletons arranged in concentric rings around a black structure rising from the center. Thousands of bodies lay there. Tens of thousands. Perhaps millions. Some were humanoid. Most were not. Many wore fragments of clothing or armor. Others carried objects that resembled tools or weapons. These were not animals swept into some prehistoric grave.

They were people.

Not human people.

But people nonetheless.

Civilizations had come here.

And they had died here.

At the center of the chamber stood the black structure. Its surface reflected no light. It possessed no seams, no doors, no recognizable mechanism. Yet the moment we approached it, every communication device in our suits began transmitting the same sound.

Breathing.

Slow.

Deep.

Patient.

Vale ordered us back.

Then the floor moved.

For several seconds my mind refused to understand what I was seeing. The skeletal layers beneath our feet shifted upward and downward in a vast rhythm.

Rising.

Falling.

Rising.

Falling.

Like the chest of a sleeping animal.

Ishikawa screamed.

Not because the floor was moving.

Because she understood first.

She opened the geological scans and stared at them while the others shouted over the radio. The scans showed the density readings from beneath the chamber. Bone extended downward for hundreds of kilometers, but beneath it lay something else—something enormous, folded within itself, occupying nearly the entire interior of the moon.

The moon was hollow.

And something was inside.

We ran.

Behind us came a sound transmitted not through the vacuum but somehow through our bones. A low vibration crawled through my skull, producing sensations that my mind interpreted as voices. I heard languages I had never learned. Screams from throats that could not have been human. Billions of voices speaking across unimaginable spans of time.

And beneath them all was a single thought.

Hunger.

We reached the surface with four people remaining.

Only three reached the lander.

Vale disappeared less than fifty meters from the hatch. One moment he was behind me. The next his radio went silent. When I turned, his footprints ended abruptly.

There was no crater.

No body.

Nothing.

Only a handprint pressed into the dust.

From beneath.

We launched immediately.

As the Orpheus climbed away from the moon, Ishikawa began calculating. She compared the density measurements, the skeletal layers, and the depth of the structures we had observed. Her face became increasingly pale.

“What?” I demanded.

She looked toward the moon through the observation window.

“The bones aren't inside it,” she said.

I didn't understand.

Then she explained.

The bones were the surface.

The mountains, valleys, plains, and craters—all of them were composed largely of skeletal material compressed across geological ages. Whatever slept within had accumulated them gradually, layer upon layer, world after world.

The moon was not a graveyard.

It was a feeding ground.

And the dead had not come from one planet.

The isotopic signatures proved that.

They had come from thousands.

Perhaps millions.

Something had traveled through the darkness between stars, feeding upon life wherever it found it, surrounding itself with the remains until those remains formed a shell.

A moon.

Our moon.

Ishikawa died before we reached Earth.

She scratched the same symbol into the wall of her quarters hundreds of times before opening the airlock.

I survived.

I sometimes wish I hadn't.

The government buried everything. The Orpheus mission was described as an equipment failure. Marius-17 disappeared from official maps. Everyone involved signed documents threatening imprisonment should we disclose what we had seen.

None of that matters anymore.

Because three nights ago, astronomers recorded a moonquake.

Yesterday there were seven.

Tonight there have been twenty-three.

I am writing this beside my bedroom window. The moon hangs above the trees, enormous and white, exactly as it has throughout all human history.

Except now I can see the cracks.

They are faint but growing.

Sometimes pale dust spills from them and drifts into space.

Bone dust.

And there is something else.

Something I have told no one.

Last night I studied the old astronomical records. Babylonian tablets. Egyptian calendars. Chinese observations. Mayan inscriptions. Records stretching backward through civilizations that watched the heavens with the same fearful fascination we possess today.

The moon has not always been here.

There are fragments of myths describing an age before it appeared. Scholars dismiss them as metaphors, corrupted calendars, primitive attempts to explain eclipses.

They are wrong.

The moon arrived.

And suddenly I understand the carvings beneath Marius-17. I understand why countless civilizations traveled there despite knowing what waited below. I understand why the skeletons in the chamber were arranged around that black object.

They had not come to worship it.

They had come to kill it.

They failed.

Now, each night, the cracks grow wider.

Yesterday I placed a telescope against my window and examined the largest fissure.

Something looked back.

Not an eye. I wish it had been an eye. An eye would have belonged to something whose anatomy I might comprehend.

This was something else.

Something for which evolution on Earth has given us no word.

And when I saw it, a thought entered my mind with such clarity that I dropped the telescope and began screaming.

The moon did not find Earth by accident.

It has been waiting.

It arrived here before humanity built its first city, before we wrote our first words, before we understood that those lights above us were other worlds.

It settled into our sky.

It watched life crawl from oceans.

It watched forests spread.

It watched mammals rise.

It watched us become human.

It watched our cities multiply until they glittered across the darkness.

And now I finally understand why the thing inside the moon has slept for so long.

It was not sleeping.

It was waiting for the harvest to ripen.