Arguments in the Void

The sheared stub of the dorsal docking collar rattled through the freighter's frame every time the portside attitude jets fired. Song Meiling wiped a greasy streak of coolant off the primary flight board with the sleeve of her flight jacket, watching the vibration spectrum spike into the yellow band on the diagnostic graph.

The Canglong had cleared Callisto Hub 4's debris field, but the ship was handling like a waterlogged barge. She needed the reaction control thrusters trimmed to within half a percent of nominal center-of-mass before their periapsis burn, or the main engine would torque them into an uncontrolled tumble across Jupiter's radiation belts.

Behind her, the pressure hatch hissed open. The smell of scorched nylon and electrical ozone rolled into the cockpit.

Gu Jianhe dragged himself through the aperture, one hand clutching a roll of silvery thermal tape. His right suit sleeve was burned clean through to the gray undersuit, revealing a red blistered patch of skin on his forearm. Ran Youzhen followed close behind, lugging an aluminum field medkit and a plastic bulb of electrolyte fluid.

"You're tracking station grit across my deck," Meiling said without turning around. She keyed a sequence into the thruster matrix to dampen the starboard shudder. "And your suit smells like an electrical fire in a recycling hopper."

"The fabricator capacitor exploded," Jianhe said, collapsing into the jump seat with a hollow thump of his mag-boots. "I didn't choose the aroma. You blew the guillotine bolts while my recovery harness was still swinging against the ventral plating."

"If I hadn't blown the bolts, that white frost would have climbed straight up our hull and turned your jump seat into a glass chandelier." Meiling tapped the delta-v ledger. "You owe me forty kilograms of hydrazine for the maneuver."

"Charge it to my station severance pay," Jianhe muttered.

Ran Youzhen knelt beside Jianhe, snapping open the medkit. She broke a cold-pack ampoule and pressed the soothing gel directly against Jianhe's forearm. Jianhe winced, his teeth set, but he did not pull away.

"Nineteen pods," Youzhen said quietly. Her voice was thin, rough with dried sweat and recycled nitrogen. "All nineteen canisters are locked down in cargo bay one. The refrigeration circuits are holding at two hundred Kelvin. Not a single seal failed during the emergency burn."

"Congratulations," Meiling said, her fingers dancing across the mass-distribution console. "You brought seventy metric tons of wet dirt and dormant rhizomes onto a ship with a burnt docking collar and exactly eleven hundred and forty meters per second of remaining propellant."

"It isn't wet dirt," Youzhen replied, smoothing a sterile dermal patch over Jianhe's burn. "It is the entire genetic heritage of the Jovian agricultural line. Ganymede frost-wheat, Callisto nitrogen-fixing lichen, and the Europa high-salinity kelp cultures. If we leave those behind, the colonies on the inner system won't have the strains to terraform the orbital domes."

"That's very inspiring, Youzhen. Truly," Meiling said. She tapped a hard diagnostic check. The lateral vibration returned, a dull rhythmic clack against the bulkhead. "Now explain to the reaction control thrusters why your frost-wheat is throwing our center of gravity four meters aft of the primary thrust line."

Jianhe leaned forward, ignoring the sting on his arm. "The cargo bay racks weren't balanced for a crash load. We had ninety seconds to shove everything through the transfer sleeve."

"Then one of you is going to help me balance the trim before the Jupiter approach burn," Meiling said. "Look at this display."

She brought up the ship's volumetric mass model. The nineteen canisters occupied the forward starboard quadrant of bay one, offset by the empty staging crates on the port side. The sheared dorsal docking collar, now a five-hundred-kilogram jagged stump of alloy on the upper hull, created an asymmetric lever arm against the main thrusters.

Meiling pulled up the telemetry log. She isolated the precise harmonic frequency of the shudder: forty-two hertz, matching the pulse width of the aft port attitude thruster.

"Look here," she said, pointing a grease-stained finger at the dynamic ledger. "The RCS is firing six micro-bursts per second just to counteract the deadweight of the severed collar. That is eating eight hundred grams of propellant every ten minutes. At this rate, we run dry two hours before we even reach the Jovian gravity well."

Jianhe squinted at the numbers, his architect's mind instantly tracing the load lines. "If we cross-feed the secondary ballast tanks in the ventral sponsons, we can offset the collar's moment arm. We don't have to move the canisters manually."

"We can't use the ventral ballast tanks," Meiling countered. "The port valve froze open when we took the thermal wash from the station's collapse. It's jammed at twelve percent."

"Then we override the actuator manually from the crawlspace," Jianhe said.

"With your charred wrist?" Meiling raised an eyebrow. "You'd drop a wrench into the primary turbine."

"I have another hand," Jianhe said. "And Youzhen knows how to turn a manual bypass nut."

"I am an ecological curator, not a pipefitter," Youzhen said, though she had already closed the medkit and latched it to the bulkhead rail.

"Today you're a pipefitter," Meiling said.

She turned back to the navigational terminal. The main screen was running the orbital projection for the Europa injection trajectory. The green trajectory curve arced out from Callisto's dead orbital slot, dipping deep into Jupiter's massive gravity well to slingshot outward toward the middle moon.

Meiling keyed in their updated total mass: ship dry weight, remaining reaction mass, Jianhe's recovered frame components, and the nineteen botanical canisters.

The trajectory curve recalculated. The line shifted from a clean, bright green to an aggressive, flashing yellow.

Meiling stared at the calculation. The numbers settled on the bottom line of the tactical plot.

"What does it say?" Youzhen asked, stepping up behind the pilot's crash couch.

"It says the math doesn't care about your Ganymede frost-wheat," Meiling said flatly.

Jianhe pulled himself up, bracing against the navigation frame. "How bad is the deficit?"

"We are sixty meters per second short on delta-v for the primary capture burn at Europa," Meiling said. "Because of the extra payload mass and the fuel burned during the rescue, our acceleration curve is too shallow. When we hit Jupiter's periapsis, the gravity assist won't sling us into the Europa transfer corridor. It puts us four seconds behind the orbital intersection window."

"Four seconds?" Youzhen frowned. "What happens in four seconds?"

"In orbital mechanics, four seconds is seventy kilometers of missing altitude," Meiling said. Her voice had dropped all its sarcastic edge, landing with the stark, cold weight of hard vacuum. "If we miss the capture corridor by seventy kilometers, we don't swing past Jupiter. We drop straight into the inner radiation belt, where the magnetic field will fry our electronics in twenty minutes."

Silence fell over the small cockpit, broken only by the steady forty-two-hertz thrum of the misaligned thrusters.

"Can we dump the emergency water reserves?" Jianhe asked.

"Already factored into the calculation," Meiling answered. "Water, reserve hydraulic fluid, and the spare atmospheric scrubbers. Even if we vent all of it, we are still nineteen metric tons over maximum allowable mass for the Europa capture trajectory."

She turned the display screen so both of them could see the blinking yellow readouts.

"Bay one has twenty metric tons of seed pods," Meiling said softly. "The math is simple. If all nineteen pods stay on this ship, none of us makes it past Jupiter."