Even the closest calculated distance from Mars to Earth was hundreds of times the distance between Earth and Moon. A distance that would even take light three minutes to travel. Under the current technical conditions, it was unrealistic to establish a supply line to and from the Mars colony and Celestial City.
At present, the research plan developed by the Aerospace Research Institute in the apocalypse was to design an engine capable of making return trips between Mars and Earth. The engine must accelerate a million-ton transport ship to escape velocity 60,000 kilometers per hour, so the duration of the trip would be between a week to half a month. Although the technical barriers were overcome long before the war, no engine drawings were available for reference. So the engine must be redesigned based on the technologies of their predecessors.
Jiang Chen felt this was the greatest misfortune.
