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The CZ-5B rocket stage is the first potentially dangerous holdover from China’s ambitions to build its own space station. On April 28, the Langer Marsch 5B rocket lifted off and carried the core module from China’s space station into space. The rocket transport stage then remained in orbit at an altitude of about 200 kilometers.
China’s space flight technicians have obviously left them to an uncontrolled sinking fate to Earth. Eleven more launches are planned before the final construction of China’s small counterpart to the International Space Station ISS. As a rule of thumb, around 80 percent of a rocket stage or satellite in the earth’s atmosphere burns up when it reenters.
Only Musk has succeeded in reusing rocket stages so far
The falling rocket steps of the Chinese have repeatedly damaged buildings in their own country shortly after they took off. The Europeans drop the first stage of their Ariane rocket into the Atlantic, and the Russians mostly crash debris into the steppe of Kazakhstan with the Soyuz rockets.
Only the technology entrepreneur Elon Musk brings the first stages of his Falcon rockets back from space in a controlled manner for reuse and has them set down vertically on sea platforms or on land.