“But you and I aren’t in a position to fix it.”

After lunching with Ding Yi, Zhang Beihai left the fusion base. Before he had driven very far, the moist ground was again covered with wet snow that glowed white under the sun. As the air temperature plummeted, his heart also chilled.

He was in dire need of a spacecraft capable of interstellar travel. If other roads led nowhere, then just one was left. No matter how dangerous it might be, it had to be taken.

*   *   *

When Zhang Beihai entered the home of the meteorite collector, situated in a courtyard house in the depths of a hutong alleyway, he noticed that the old, dimly lit home was like a miniature geological museum. Each of its four walls was lined with glass cases in which professional lights shone on rock after unremarkable rock. The owner, in his fifties, hale in spirit and complexion, sat at a workbench examining a small stone with a magnifying lens, and he greeted the visitor warmly when he saw him. He was, Zhang Beihai noticed immediately, one of those fortunate people who inhabited a beloved world of his own. No matter what changes befell the larger world, he could always immerse himself in his own and find contentment.

In the old-fashioned atmosphere unique to old houses, Zhang Beihai was reminded that he and his comrades were fighting for the survival of the human race, while the majority of people were still clinging to their existing lives. This gave him a sense of warmth and peace of mind.

The completion of the space elevator and the breakthrough in controlled fusion technology were two enormous encouragements to the world, and eased defeatist sentiment to a considerable extent. But sober leaders were aware that this was only the beginning: If the construction of the space fleet was analogous to naval fleets, then humanity had just now arrived at the seashore, carrying tools. Not even the shipbuilding dockyards had been built yet. Apart from the construction of the main spacecraft body, research into space weapons and recirculating ecosystems, as well as the construction of space ports, represented an unprecedented technological frontier for humanity. Just getting the foundations in place might take a century.