Scientists Track Chinese Space Station's Final Hours in Orbit
By VOA News March 31, 2018
Scientists are monitoring a defunct Chinese space station that is expected to fall to Earth sometime this weekend – the largest man-made object to re-enter Earth's atmosphere in a decade.
The head of the European Space Agency's debris office, Holger Krag, says China's Tiangong-1 space station likely will fall to Earth Sunday.
Krag said it still not yet known where the space station will hit Earth, but said it would be extremely unlikely for anyone to be injured when it does.
"Our experience is that for such large objects typically between 20 and 40 percent of the original mass, of 8.5 tons, will survive re-entry and then could be found on the ground, theoretically," he said.
"However, to be injured by one of these fragments is extremely unlikely. My estimate is that the probability to be injured by one of these fragments is similar to the probability of being hit by lightning twice in the same year," Krag added.
China's first space lab, Tiangong-1 – or "Heavenly Palace 1" – was launched in 2011 as a facility for testing docking capabilities with other Chinese spacecraft and to explore the possibilities for building a larger permanent space station by 2023.
Chinese astronauts visited it several times flying aboard the Shenzhou spacecraft.
It was scheduled for a controlled de-orbit and eventual crash into the Pacific Ocean, but in September 2016 China's space agency conceded it had lost contact with the station.
Krag, says the 8-and-a-half ton craft will re-enter the atmosphere at a speed of 27,000 kilometers per hour.
He said the space station is expected to fall between the areas of 43 degrees south and 43 degrees north, and everything outside that zone is considered safe.
"Northern Europe including France, Germany, Austria and Switzerland are definitely on the safe side. Southern Europe, the southern part of North America, South Asia, Africa, Australia and also South America are still within the zone today," he said.
The re-entry area covers huge parts of the Earth's oceans, so any surviving pieces of the space station are most likely to end up at the bottom of the sea.
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