We Promised to Build Rockets, but What the Hell Is an Aerospace Plane?

In 2047, Blue Star faced the crisis of colliding with Pluto, and was stabbed in the back by the Lighthouse State just when it was about to succeed. Qin Sheng, the chief scientist of mankind, took the rebirth of the technology tree back to two years before the crisis broke out. He started to develop aerospace planes for the Xia Kingdom and broke the siege of the Lighthouse Kingdom. In order to solve the crisis, he continued to lead Xia scientists to break through one difficulty after another, such as orbital defense system, controllable nuclear fusion, space factory, moon city... In repeated collisions with the Lighthouse Country, the real culprit behind it gradually emerged. Looking at the densely packed space battleships of humans, the real murderer was confused: "You, a level 0 civilization, have so many battleships?"