BEIJING — China’s defunct and reportedly out-of-control Tiangong 1 space station is expected to reenter 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, 8.5-ton vehicle is expected to burn up on reentry, although space agencies don’t know exactly when or where that will happen.

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

What will happen and how great is the danger?

The European Space Agency predicts the station will reenter 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 reentry 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 reentry.

Based on Tiangong 1’s orbit, it will come to earth somewhere between 42.7 degrees of latitude north and 42.7 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 reentry, mainly its heavier components such as its engines. The chances of anyone on earth being hit by debris is considered less than one in a trillion.

How common is human-made space debris?

Debris from satellites, space launches and the International Space Station enters the atmosphere every few months, but only one person is known to have been hit by any of it: American woman Lottie Williams, who was struck but not injured by a falling piece of a US Delta II rocket while exercising in an Oklahoma park in 1997.

Most famously, America’s 77-ton Skylab crashed through the atmosphere in 1979, spreading wreckage near the southwestern Australia city of Perth, which fined the United States $400 for littering.

The breakup on reentry of the Columbia space shuttle in 2003 killed all seven astronauts and sent more than 80,000 pieces of debris raining down on a large swath of the southern United States. No one on the ground was injured.

In 2011, NASA’s Upper Atmosphere Research Satellite was considered to pose a slight risk to the public when it came down to earth 20 years after its launching.

Debris from the 6-ton satellite ended up falling into the Pacific Ocean, causing no damage.

China’s own space program raised major concerns after it used a missile to destroy an out-of-service Chinese satellite in 2007, creating a large and potentially dangerous cloud of debris.