The signal arrived on a Tuesday, which Dr. Eliza Morrow considered deeply inappropriate. Signals from extraterrestrial intelligence were supposed to arrive on dramatic occasions — during solar eclipses, at the moment of some cosmic catastrophe, on days that would later be remembered as the day humanity learned it was not alone.

Tuesday was not a dramatic day. It was a day for eating recycled-space-rat stew and monitoring oxygen levels. It was a day for staring at screens and watching numbers that meant the difference between life and death.

The signal was simple. Three repetitions of a prime number sequence, followed by a message in mathematical language that anyone with a basic training in astrobiology could decode.

Eliza read it three times before she allowed herself to believe it.

"Do you understand what this says?" she asked Dr. Thomas Chen, who was sitting across from her in the command module of the Scotland Station, eating cold noodles from a foil pouch.

Thomas wiped his mouth with the back of his hand and leaned over to look at the screen. His dark eyes widened. "It says: 'Is your civilization worth remembering?'"

The words hung in the air like the smell of recycled air — omnipresent and inescapable. Eliza stared at the screen and felt the weight of four thousand light-years pressing down on her. The Scotland Station was the most distant human outpost in the known universe, orbiting a brown dwarf in the Begonia system. She and her crew had been here for three years, studying a star that would never be seen by human eyes.

Three years of isolation. Three years of watching numbers on screens. Three years of wondering if any of this mattered.

The signal had come from beyond Begonia, from a direction that pointed toward the galactic core. Whatever had sent it had been traveling for thousands of years to reach them. It had chosen this station, this moment, this specific frequency to deliver its message.

It was not an accident. It was not a mistake.

"It's a test," said Dr. James Park, the station's linguist, who had been quiet until now. He was staring at the screen with an expression that might have been wonder or might have been terror. "Or it's a judgment. Or it's both. But it's deliberate."

Eliza felt the silence of space pressing against the hull of the station. Fourteen people on this station, each carrying the hopes and fears of a species that stretched back three million years. Three million years of evolution, of culture, of art and war and love and loss — reduced to a single yes-or-no question that someone, somewhere, was asking them to answer.

"What happens if we don't answer?" Thomas asked.

James shook his head. "I don't think we have a choice. The signal was sent to us specifically. If we ignore it, we're answering — we're saying our civilization isn't worth remembering. And I don't think that's the right answer."

"Who are you to decide?" Eliza asked sharply. "Who are any of us to decide?"

But she knew the answer. They were the people who had been chosen, by accident or design, to be the witnesses of their species at this particular moment. They were the eyes through which humanity would be seen — or not seen — by something vast and alien and incomprehensible.

That night, Eliza stood in the observation deck and looked out at the stars. They were bright and cold and indifferent, each one a sun with its own system of planets and possibly civilizations. Somewhere out there, someone was asking if humanity was worth remembering.

She thought about her life — forty-five years of studying stars, of watching them burn and die and be born again. She thought about the art she had made as a child, the books she had read, the friends she had lost, the dreams she had abandoned. She thought about the station, and the fourteen people who depended on her, and the Earth that was four thousand light-years away and felt very far.

We are worth remembering, she thought. Not because we are perfect or because we deserve it, but because we are alive and we are trying and we are here.

She went back to the command module and sat down at the terminal. Her fingers hovered over the keys, and then she began to type. The reply would take hours to compose and days to transmit. By the time it reached its destination, three thousand years of human history would have passed.

But she was typing it anyway. Because that was what you did when you were asked a question. You answered it. And the answer, however it was received, would be the most honest thing humanity had ever said.