The Last Signal

The first signal arrived at 03:17 Earth Standard Time, precisely eleven seconds after the clocks aboard the research station Asterion synchronized with the atomic clock in Geneva.

Dr. Mara Venn was the only person awake.

She had been staring through the observation window at Saturn for nearly an hour, watching the enormous planet rotate beneath a thin veil of artificial night. The station orbited one of Saturn’s outer moons, far beyond the traffic lanes used by commercial ships. Out here, there were no advertisements, no cargo vessels, no tourists, and no voices from Earth unless someone deliberately opened a communication channel.

Mara preferred it that way.

She was reaching for her coffee when the console behind her chimed.

Not the ordinary notification tone.

It was a sound she had never heard before.

Mara turned.

A single red symbol was blinking on the communications terminal.

She frowned and walked toward it.

“That’s impossible,” she whispered.

The station’s external receiver had detected a transmission.

That alone was not unusual. Space was full of radio noise: pulsars, solar interference, distant ships, satellites, and the endless electronic chatter of humanity. But this transmission was different.

It was coming from somewhere inside the orbit of Saturn.

Mara sat down and opened the signal.

The screen filled with numbers.

At first, they looked random. Then she noticed the pattern.

Prime numbers.

She stared at the screen.

“One hundred and thirteen. One hundred and twenty-seven. One hundred and thirty-one…”

Her hands became cold.

The sequence continued.

She activated the station’s automatic analysis system.

“Identify source.”

The computer processed the signal for several seconds.

Then it answered.

“Source unidentified.”

“Distance?”

“Three hundred and twelve thousand kilometers.”

Mara looked toward the window.

The signal was coming from Saturn’s rings.

She immediately woke the station’s commander.

Captain Elias Ward appeared on the communications screen wearing a shirt that was clearly not designed for professional appearances. His hair was disordered, and he looked as though someone had dragged him out of a very deep sleep.

“What happened?”

“Wake everyone.”

Elias stared at her.

“Mara, it’s three in the morning.”

“I know.”

“Is Saturn exploding?”

“No.”

“Then why—”

“We’ve received a signal.”

His expression changed.

“From Earth?”

“No.”

“From a ship?”

“No.”

He became silent.

“Where?”

“The rings.”

For several seconds neither of them spoke.

Finally Elias said, “I’ll be there in five minutes.”

He arrived in less than three.

By then, the rest of the crew had gathered around the communications station. Six people stood behind Mara, watching the sequence scroll across the screen.

Engineer Pavel Orlov folded his arms.

“Could be a military transmitter.”

“There’s no military equipment anywhere near here,” Mara said.

“Could be an old probe.”

“We checked the registry. Nothing is transmitting.”

“What about a collision?” asked Dr. Chen. “Something reflecting a signal?”

Mara shook her head.

“The signal contains information.”

Elias leaned closer.

“What kind?”

“Mathematics. Then chemistry. Then something else.”

“What?”

“I don’t know yet.”

Mara enlarged the display.

The sequence changed.

The prime numbers disappeared.

A diagram appeared.

It showed the structure of a hydrogen atom.

Then carbon.

Then DNA.

Then something that looked almost like a human brain.

Nobody spoke.

Pavel finally said, “That’s not a natural transmission.”

“No,” Mara replied.

Elias looked at her.

“Can we answer?”

Mara hesitated.

“Technically.”

“Should we?”

Nobody answered.

The station’s lights flickered.

Everyone turned toward the ceiling.

Then the computer spoke.

“Incoming transmission.”

Mara stared at the screen.

“We didn’t answer.”

“I know,” Elias said.

The screen went black.

A moment later, a sentence appeared.

WE HAVE BEEN LISTENING.

Chen took a step backward.

“Listening to what?”

The computer translated the next transmission.

YOU.

Elias looked at Mara.

“Who are they?”

Mara slowly shook her head.

“I don’t know.”

The next sentence appeared.

YOU ARE NOT THE FIRST.

The room became silent.

Mara felt a strange pressure in her chest.

“Ask them what that means.”

Elias looked at her.

“Are you sure?”

“No.”

“Good enough.”

Mara typed.

WHO ARE YOU?

The answer arrived immediately.

WE WERE LIKE YOU.

Mara swallowed.

“Ask where they are.”

She typed again.

WHERE ARE YOU?

This time the answer took longer.

When it appeared, the words were accompanied by a set of coordinates.

Mara entered them into the station’s navigation system.

The computer displayed the location.

Saturn’s rings.

Everyone stared at the coordinates.

Pavel whispered, “That’s impossible.”

Mara zoomed in.

The location was not somewhere in the rings.

It was beneath them.

Deep inside the planet.

Elias stepped away from the console.

“No.”

Mara looked at him.

“That’s where they’re coming from.”

“We can’t go there.”

“We don’t have to.”

The station shook.

A deep vibration moved through the floor.

The lights dimmed.

The computer began issuing warnings.

“Gravitational anomaly detected.”

Mara ran to the observation window.

Saturn had changed.

At first she thought clouds were moving across its surface.

Then she realized the entire planet was glowing.

A thin blue line appeared around its equator.

Pavel shouted, “What the hell is that?”

The line widened.

Something was opening.

Not a storm.

Not an explosion.

A structure.

Enormous geometric shapes began emerging from beneath Saturn’s atmosphere, each one larger than a city. They rose silently through the clouds, surrounded by blue light.

Mara watched in disbelief.

“Those were built.”

Elias grabbed the emergency communication system.

“All crew, evacuation protocol. Get to the escape pods.”

Chen looked at him.

“What about the signal?”

“Forget the signal.”

The station shook violently.

Something had appeared outside.

A sphere.

It floated less than a kilometer from the Asterion.

Its surface was completely black, absorbing the light from Saturn.

Then a door appeared.

No mechanical movement.

No hinges.

It simply became an opening.

Mara stared at it.

“I think it wants us to come aboard.”

Elias shook his head.

“Absolutely not.”

The computer chimed.

A new message appeared.

ONE OF YOU MUST COME.

Mara felt an inexplicable certainty.

“Me.”

Elias turned.

“No.”

“They contacted me.”

“They contacted the station.”

“They woke me first.”

“Mara.”

She looked at him.

“If we leave without knowing what they want, we’ll spend the rest of our lives wondering.”

“If we go aboard that thing, we might not have the rest of our lives.”

Mara smiled faintly.

“Then I suppose we should make them count.”

She entered the docking chamber.

Elias followed.

“You are not going alone.”

The sphere opened wider.

Mara and Elias stepped inside.

The interior was unlike anything either of them had seen. There were no walls, floors, or ceilings in the traditional sense. Everything appeared to be made from a dark material that shifted subtly beneath their feet.

Then the room changed.

Suddenly, Mara was standing in a forest.

She could feel wind on her face.

She could smell rain.

Elias reached for his weapon.

“Don’t.”

A voice spoke from behind them.

“You will not need that.”

They turned.

A figure stood among the trees.

It was tall and thin, with translucent skin and eyes that seemed to contain entire galaxies.

Mara stared.

“Are you real?”

The creature smiled.

“Not anymore.”

Elias raised his weapon.

The creature did not react.

“What happened to your civilization?” Mara asked.

“We discovered the universe was not empty.”

“And?”

“We discovered that something was listening.”

Mara felt a chill.

“What?”

The creature looked upward.

The artificial sky above the forest began to darken.

“Something older than stars.”

Elias lowered his weapon slightly.

“Where is it?”

The creature looked at Mara.

“Everywhere.”

The forest disappeared.

Mara suddenly found herself standing in darkness.

Around her floated millions of lights.

Stars.

Galaxies.

Entire civilizations.

Then she noticed something moving between them.

Something enormous.

It had no shape, because shape was too small a concept to describe it.

It moved through space as if space were water.

Mara couldn’t breathe.

“What is that?”

The creature’s voice came from everywhere.

“The universe is not a place.”

The darkness trembled.

“It is a signal.”

Mara stared at the impossible thing.

“And who’s receiving it?”

The creature answered quietly.

“We are.”

The stars began disappearing.

One by one.

Mara grabbed Elias’s arm.

“What do we do?”

The creature looked at her.

“You have already done it.”

“What?”

“You answered.”

Mara remembered the signal.

The prime numbers.

The diagrams.

The question.

WHO ARE YOU?

Her stomach tightened.

“You wanted us to answer.”

“We needed to know if you were awake.”

“And now?”

The creature smiled.

“Now it knows too.”

The sphere vanished.

Mara and Elias were suddenly back aboard the Asterion.

For several seconds, neither spoke.

Then every screen on the station turned black.

A single message appeared.

HELLO, HUMANITY.

Mara stared at it.

Elias whispered, “What did we do?”

Outside the window, Saturn’s rings began to glow.

Then the stars disappeared.

Not one by one.

All at once.

And for the first time in human history, the night side of Earth went completely dark.

Somewhere beyond the edge of the solar system, something ancient had finally received an answer.

And it was answering back.