Two Weeks Later. The Warehouse.
I watched the monitor as the latest slug vanished into the floor-mounted shaft. Thwump. Another kilogram of refined Neodymium on its way to the Moon. The silence of the launch still gave me goosebumps. "Delivery status?"
"Slug #42 impacts in three hours," Archi reported. "Recovery rate is 100%. The nanites on the lunar surface are catching them like a goalkeeper catching slow-motion balls. We have the materials. The magnetic containment ring is complete."
"So we can turn it on?"
"We can. But there is a thermodynamic complication."
I sighed, leaning back in my office chair (a rescued ergonomic model from a bankrupt law firm). "There's always a complication. What is it? Did we forget the batteries?"
"Heat," Archi stated. A hologram of the lunar base appeared. It was buried deep under the regolith, invisible from the surface. But in the center, a red sphere was pulsing.
"A Helium-3 fusion reactor generates massive amounts of energy. And energy creates waste heat. On Earth, you use water cooling towers or rivers. In space, we are in a vacuum."
"But space is cold," I argued. "Can't we just... open a window?"
"Common misconception. Vacuum is an insulator. It's like a thermos flask. The heat has nowhere to go because there is no air to carry it away. If I ignite the reactor without a cooling solution, the base will melt into a puddle of slag within forty seconds. We will cook ourselves in our own juices."
"Okay, that sounds bad. Solution?"
"Radiators. Massive ones. We need to pump the coolant to the surface and run it through panels that radiate the heat away as infrared light."
P=ϵσA(T4−Tenv4)
Archi projected a formula in the air, then quickly dismissed it when he saw my blank stare. "Physics says: Big hot panels. We need to unfold them on the surface."
"Surface panels?" I frowned. "Archi, we are trying to hide. Giant glowing panels on the Moon's surface aren't exactly stealthy."
"We have no choice. It's either visibility or death by overheating. I have designed deployable radiator wings. They will unfold only when necessary. But be warned: When the reactor is running at full power, we will be the brightest infrared object on the dark side of the Moon. To a standard telescope, we are invisible. To an infrared sensor... we are a bonfire."
I looked at the schematic. The panels looked like black insect wings . "Do it," I decided. "We need the power to expand. Just... try to keep it on low flame when satellites are looking."
The Moon. Von Kármán Crater. Underground.
If I could have stood there, 20 meters beneath the grey dust, I would have heard a hum. A deep, resonant vibration that shook the very bedrock of the Moon. The reactor came online. Inside the magnetic bottle, atoms of Helium-3 smashed together, fusing, releasing the energy of a captured star. Power flooded the base. The lights in the habitat flickered on—real, bright LED light, not the dim emergency glow. The nanite fabricators roared to life, no longer starved for energy.
But above, on the surface, the dust began to shift. Like a flower blooming in fast-forward, four massive, dark panels unfolded from the crater floor. They were black as void, designed to emit heat efficiently. As the coolant rushed through them, they began to glow. First a dull red, then a shimmering orange, invisible to the naked eye but screaming into the void in the infrared spectrum.
Purple Mountain Observatory, China Near Earth Object Survey Telescope
Dr. Li adjusted the calibration on the thermal imaging sensor. He was scanning for Near-Earth Asteroids, boring rocks that might threaten Earth in a hundred years. Suddenly, a pixel on his screen flared white.
"Glitch?" he muttered, tapping the monitor. He reset the sensor. The pixel remained. It wasn't an asteroid. It was stationary. It was on the Moon.
"Sector 4, Far Side," he whispered, checking the coordinates. "That's... directly inside the landing zone for the upcoming Chang'e mission."
He zoomed in. The thermal signature was steady. It wasn't an impact flash (too short). It wasn't solar reflection (it was night in that sector). It was a heat source. A steady, regulated output of approximately 500 Megawatts.
Dr. Li picked up the phone. His hand was trembling slightly. "Director? We have a situation. Something on the dark side is... warm. Very warm. And it just switched on."
Back at the Warehouse
"Reactor stable," Archi announced. "Output at 15%. We have infinite power, Surgrim. The radiator wings are holding steady at 800 Kelvin."
"800 Kelvin?" I did the math in my head. "That's over 500 degrees Celsius. Archi, we just lit a flare."
"Let them look," Archi said, his voice filled with a dangerous kind of pride. "By the time they figure out what it is, we will have built a fleet."