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USA! Heads Up This Weekend For Tiangong 1


Tiangong 1, China’s defunct space lab, hurtling toward Earth for re-entry

China’s Long March 2F rocket carrying the Tiangong-1 module, or “Heavenly Palace,” blasts off from the Jiuquan launch center in Gansu province on Sept. 29, 2011. GETTY

BEIJING — China’s defunct and reportedly out-of-control Tiangong 1 space station is expected to re-enter Earth’s atmosphere sometime this weekend. It poses only a slight risk to people and property on the ground, since most of the bus-size, the 8.5-ton vehicle is expected to burn up on re-entry, although space agencies don’t know precisely when or where that will happen.

Below are some questions and answers about the station, its re-entry and the past and future of China’s ambitious space program.

What will happen and how high is the danger?
The European Space Agency predicts the station will re-enter the atmosphere between Saturday morning and Sunday afternoon — an estimate it calls “highly variable,” likely because the ever-changing shape of the upper atmosphere affects the speed of objects falling into it.

The Chinese space agency’s latest estimate puts re-entry between Saturday and Wednesday.

Western space experts say they believe China has lost control of the station. China’s chief space laboratory designer Zhu Zongpeng has denied Tiangong was out of control but hasn’t provided specifics on what, if anything, China is doing to guide the craft’s re-entry.

Based on Tiangong 1’s orbit, it will come to Earth somewhere between latitudes of 43 degrees north and 43 degrees south, or roughly somewhere over most of the United States, China, Africa, southern Europe, Australia and South America. Out of range are Russia, Canada and northern Europe.

Based on its size, only about 10 percent of the spacecraft will likely survive being burned up on re-entry, mainly its heavier components such as its engines. The chances of any one person on Earth getting hit by debris is considered less than one in a trillion.

“This is a big thing the size of a school bus. Most of the stuff in it will burn up in the atmosphere,” Mordecai-Mark Mac Low, curator of astrophysics at the American Museum of Natural History, told CBS New York.

Ren Guoqiang, China’s defense ministry spokesman, told reporters Thursday that Beijing has been briefing the United Nations and the international community about Tiangong 1’s re-entry through multiple channels.


An artist’s illustration of China’s Tiangong-1 space lab in Earth orbit. CHINA MANNED SPACE ENGINEERING OFFICE

Chances of Tiangong 1 hitting the U.S., go to>

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