Remembrance of Earth's Past, #3
Death's End
by Cixin Liu
Contents
Excerpt from A Past Outside of Time The Staircase Program
Overview
This excerpt explains the technical logic and historical significance of the Staircase Program, presenting it as a desperate but ingenious use of primitive Crisis Era technology. By comparing it to ancient weapons that seemed ahead of their time, the text frames the program as a temporary leap rather than a true technological revolution.
The chapter clarifies how nuclear bombs, a radiation sail, ultrathin cables, and a protected payload capsule made it possible to accelerate a tiny probe to 1 percent of lightspeed. This reinforces both the ambition and the limitations behind humanity's attempt to reach the Trisolaran Fleet.
Summary
The excerpt compares the Staircase Program to earlier weapons such as the Ming Dynasty's Huolong Chu Shui and ancient repeating crossbows. These inventions used primitive technology in unusually ambitious ways, producing effects that seemed ahead of their eras.
The text argues that the Staircase Program was similarly anachronistic. At the beginning of the Crisis Era, humanity used existing spaceflight and nuclear technology to design a probe capable of reaching 1 percent of lightspeed, a feat otherwise associated with technology from a much later age.
The program depended on placing nuclear bombs along the probe's acceleration path. As the probe passed each bomb, the bomb had to detonate with precise timing so the radiation sail could receive propulsion. Although the speed increased dramatically, the required timing remained within the technical capabilities of the period.
Because the probe had no engine, its course depended entirely on the positions and detonation geometry of the bombs. Each bomb had small thrusters, allowing adjustments that controlled the direction of the force applied to the sail and therefore the probe's trajectory.
The payload was pulled behind the thin radiation sail in a capsule connected by roughly five hundred kilometers of ultrathin, strong Flying Blade cables. An ablative layer protected and cooled the capsule as nuclear explosions vaporized material away. The excerpt concludes that, despite its brilliance, the Staircase Program was not the start of a true new Space Age but a desperate use of all available primitive human technology.