China Criticized For 'Unplanned' Tumbling of Its Booster Rockets Back to Earth

China launched the final module for its space station last Monday. But this also meant that a massive booster rocket re-entered the earth's atmosphere, notes the Washington Post - "for the fourth time in less than three years." This one came down in the Pacific Ocean shortly after 6 a.m. Friday, and "there were no initial reports of damage or injuries. "But its return to Earth highlighted a tension among space faring nations over China's practice of letting its spent rockets tumble back to Earth after days in orbit."While the chances are low of any one person getting hit by the returning space debris, several of the tracks the rocket possibly could have taken passed over a large swath of the Earth's populated areas. NASA Administrator Bill Nelson has repeatedly condemned China for the practice. In a statement Friday morning, he said: "It is critical that all spacefaring nations are responsible and transparent in their space activities and follow established best practices, especially, for the uncontrolled reentry of a large rocket body debris - debris that could very well result in major damage or loss of life." China is alone among space-faring nations in allowing the unplanned return of its boosters, instead of ditching them at sea, as most others do, or returning them to a soft landing, like Space X. "The technology exists to prevent this," said Ted Muelhaupt, a consultant in the chief engineer's office at the Aerospace Corporation, a nonprofit that drew possible tracks for the rocket's return. The rest of the world doesn't "deliberately launch things this big and intend them to fall wherever. We haven't done that for 50 years." As of Wednesday, the [research nonprofit] Aerospace Corporation's calculations had the stage possibly landing over areas of land where 88 percent of the world's population lives. And so the possibility of casualties, Muelhaupt said, was between one in 230 to one in 1,000. That risk far exceeds the internationally recognized standard that says a reentering space object should not have greater than a one in 10,000 chance of causing injury. The Chinese rocket stage is massive - weighing 22 metric tons and measuring as long as a pair of 53-foot semitrailers parked end to end, Muelhaupt said. He estimated that between 10 and 40 percent of the booster would survive reentry.

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