Fear not, burnt-out space lab 鈥榥o threat鈥
Print Edition
China鈥檚 first space lab Tiangong-1 will mostly be burnt up in the atmosphere and it鈥檚 highly unlikely to cause any damage on the ground, according to an article published by China Manned Space Engineering Office.
鈥淭here is no need for people to worry about its re-entry into the atmosphere. It won鈥檛 crash to the Earth fiercely, as in sci-fi movie scenarios, but will look more like a shower of meteors,鈥 the article said.
During a meteor shower, about 1,000 to 20,000 meteorites fall to Earth per hour, and the probability of anyone being hit by a meteorite of more than 200 grams is one in 700 million, it said.
The CMSEO announced earlier that Tiangong-1 has seen its orbit decay since it ended its data service on March 16, 2016, and will re-enter the atmosphere between March 31 and April 4.
Tiangong-1, with a weight of about 8 tons, much smaller than the 80-ton Skylab and 140-ton Mir, and is unlikely to affect aviation activities or cause damage on the ground, said the CMSEO in the article.
The re-entry process is usually divided into three phases. During the first phase, the atmospheric drag will rip solar arrays, antennas, and other external parts off a spacecraft at an altitude of about 100 kilometers.
As it continues to fall, the main structure of the spacecraft will burn up or explode from increasing heat and friction. It normally disintegrates at an altitude of about 80 kilometers.
The fragments will keep burning and most of them will get dissipated in air. Only a small amount of debris will reach the ground, and will float down at a very slow speed due to their small mass.
The surviving fragments will most likely fall into the oceans, which cover more than 70 percent of the Earth鈥檚 surface, instead of hitting densely populated areas, the article said.
More than 15,000 tons of spacecraft debris have fallen to Earth since the 1960s, but nobody has ever been hurt by it, the article said. Tiangong-1 has made important contributions to China鈥檚 manned space cause, the article said.
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