Soru

The following passage is a literary narrative describing Cassian, an astronomer awaiting a stellar transit.

The wind off the ridge did not blow so much as it pressed, a steady, cold weight against the copper dome of the observatory. Inside, the silence was absolute, save for the rhythmic, metallic *shuck-shuck* of the telescope’s tracking motor. Cassian kept his eyes fixed on the digital chronometer. 02:14:05. The stellar transit of the anomaly known as Kepler-186f’s companion was scheduled to begin in precisely eleven minutes. For three decades, Cassian had waited for this transit, a sliver of light passing across a distant star that would either confirm his life’s work or relegate his calculations to the scrap heap of astronomical eccentricities.

To pass the minutes, he began his routine calibration check, his hands moving with the deliberate, almost agonizing slowness of a man who knew that a single degree of error would ruin everything. He adjusted the spectroscopic feed. He checked the cooling system of the CCD camera; the liquid nitrogen hissed, a tiny plume of white vapor vanishing into the dry mountain air. Each adjustment took seconds, yet in the quiet of the dome, each second felt elongated, stretched thin like glass. He remembered his first night at this mountain station, thirty years ago, when the telescope was new and his mentor, Dr. Aris, had stood where Cassian stood now. Aris had been impatient then, his fingers tapping a restless rhythm on the brass casing of the old analog dials. "The stars do not hurry for us, Cassian," Aris had said, his voice raspy from the cold. "We are the ones who must learn to stretch time."

Now, Cassian understood. The memory faded back into the dark corners of the dome, and he looked back at the chronometer: 02:21:40. Seven minutes had elapsed, though it felt like hours. The pacing of his breath matched the steady tick of the tracking motor.

Then, a sudden, sharp crack shattered the quiet.

The tracking motor stuttered, its rhythmic hum replaced by a harsh, grinding whine. The digital coordinate display flickered, the numbers spinning wildly. Cassian’s pulse surged. The transit was five minutes away. In an instant, the deliberate, slow-motion atmosphere of the dome collapsed. Cassian lunged across the platform, his boot catching on a stray cable. He scrambled up, his hands flying over the manual override controls. The gears ground again, a sound of metal tearing metal. If the tracking system failed, the telescope would drift, missing the narrow window of the transit entirely.

He had to recalibrate the gears manually—a process that normally took twenty minutes of precise calculations and delicate physical adjustments. He didn't have twenty minutes. He had four.

His fingers, usually so steady, were cold and clumsy. He grabbed the heavy brass spanner from the workbench, his movements a blur of desperate motion. He loosened the primary collar, his knuckles scraping against the housing, drawing a thin line of red that he didn't feel. Two minutes. He turned the manual positioning crank, watching the alignment guides on the auxiliary screen. The green reticle was miles off-center. He spun the crank faster, his breath coming in ragged, shallow gasps. One minute, thirty seconds. The grinding stopped, replaced by a tense, resistant silence as the gears re-engaged. He peered through the guide scope, his eye watering against the cold glass. The target star, a tiny beacon of icy blue, was drifting toward the edge of the field of view. He nudged the fine-adjustment dial. Ten seconds. The star stabilized in the center of the crosshairs.

At 02:25:12, the blue star began to dim. The spectroscopic graphs on the main monitor dipped, a clean, sharp valley forming on the grid. The transit had begun. Cassian stood frozen, his hand still resting on the cold metal dial, his chest heaving as the silence of the dome slowly settled back over him, heavy and undisturbed.

Which of the following best describes the structural function of the flashback to Cassian’s first night at the observatory in relation to the overall pacing of the passage?