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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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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Researchers in Australia have begun an ambitious task to learn more about the long-term impacts of head injuries suffered by athletes. This week, the Australian Sports Brain Bank was launched in Sydney, and experts are encouraging players who have participated in all levels of sport – whether or not they’ve had a head injury – to donate their brains to the cause after they die.

The Brain Bank has been set up to investigate links between concussion, head injuries and Chronic Traumatic Encephalopathy, or CTE.  It is a neurodegenerative disease found in people with a history of repetitive brain trauma.

The Australian study is being supported by American researchers, who set up a similar brain bank a decade ago.

Dr. Chris Nowinski, head of the Boston-based Concussion Legacy Foundation which has examined the brains of deceased National Football League players, says the presence of CTE among them is pervasive.

“Any contact sport where you receive repetitive brain trauma puts you at risk for this disease.  We do not know at what risk but we have seen CTE in 110 of the first 111 players that we have studied, which has really surprised us.”

Nowinski believes energy from blows to the head during competition causes brain tissue to move.  Symptoms of CTE include depression, aggression and memory loss, and can take years or decades to appear.

The cause of CTE has yet to be established, but the disease has prompted a class action lawsuit in the U.S.

Australia’s Brain Bank is a joint venture between Sydney University and the city’s Royal Prince Alfred Hospital.  It hopes to obtain 500 brains over the next 10 years.

 
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Researchers in Australia have begun an ambitious task to learn more about the long-term impacts of head injuries suffered by athletes. This week, the Australian Sports Brain Bank was launched in Sydney, and experts are encouraging players who have participated in all levels of sport – whether or not they’ve had a head injury – to donate their brains to the cause after they die.

The Brain Bank has been set up to investigate links between concussion, head injuries and Chronic Traumatic Encephalopathy, or CTE.  It is a neurodegenerative disease found in people with a history of repetitive brain trauma.

The Australian study is being supported by American researchers, who set up a similar brain bank a decade ago.

Dr. Chris Nowinski, head of the Boston-based Concussion Legacy Foundation which has examined the brains of deceased National Football League players, says the presence of CTE among them is pervasive.

“Any contact sport where you receive repetitive brain trauma puts you at risk for this disease.  We do not know at what risk but we have seen CTE in 110 of the first 111 players that we have studied, which has really surprised us.”

Nowinski believes energy from blows to the head during competition causes brain tissue to move.  Symptoms of CTE include depression, aggression and memory loss, and can take years or decades to appear.

The cause of CTE has yet to be established, but the disease has prompted a class action lawsuit in the U.S.

Australia’s Brain Bank is a joint venture between Sydney University and the city’s Royal Prince Alfred Hospital.  It hopes to obtain 500 brains over the next 10 years.

 
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Chef Rob Morasco didn’t set out to make a planet-friendly burger.

But the 25 percent mushroom burger he created at food service company Sodexo not only has a lower carbon footprint, it’s also lower in calories, fat and salt.

It’s juicier, too.

“When you bite into it, it’s kind of like a flavor explosion,” Morasco said. “And you don’t taste the mushrooms, either.”

And because mushrooms are cheaper than beef, he could answer customer demand for antibiotic- and hormone-free burgers “without having to jack up the price,” he said.

Mushroom-blended burgers have been catching on among both chefs and environmentalists. In March, Sonic Drive-In became the first fast-food chain to offer them.

WATCH: These Burgers Are Better for the Planet, but You’d Never Know It

​2 million cars

Americans eat about 10 billion hamburgers each year, according to the World Resources Institute (WRI).

All those burgers take a toll on the planet.

Beef is “the most resource-intensive food that we commonly eat,” Richard Waite of WRI said.

Beef accounts for about half the greenhouse gases produced by the American diet, he added. Cows take far more feed, land and water than any other source of protein.

If every burger in America were blended with mushrooms, WRI estimates the greenhouse-gas savings would be like taking more than 2 million cars off the road.

It would save as much water as nearly 3 million American households use in a year. And it would reduce the demand for farmland by an area larger than the state of Maryland.

For the carnivore

Blended burgers are part of The Culinary Institute of America and Harvard T.H. Chan School of Public Health’s Menus of Change project, challenging chefs across the food industry to make their meals healthier and more sustainable.

Demand for meatless meals is growing along with rising health and environmental concerns. There are bean burgers, soy burgers, even beet-infused veggie burgers that “bleed.”

But it’s a limited market.

“The veggie burgers tend to cater to folks who identify as vegetarian or vegan, or actively want to be eating less meat,” Waite said.

On the other hand, blended burgers appeal to “the real carnivores, someone who really loves meat,” he added. “This is potentially a dish that could have broad mainstream appeal and also pretty big environmental benefits.”

Helps keep burgers juicy

Chefs say the mushrooms retain water, helping the burger stay juicy as it cooks.

Sonic Drive-In’s ads for its new Signature Slinger blended burger play up the juiciness and the lower calories.

“When you’re about something that is going to be better for you, it had better deliver the flavor first,” said Scott Uehlein, vice president for product innovation and development at Sonic Drive-In.

The company is piloting the burgers in a two-month trial run.

And the potential goes beyond burgers.

About 400 cafeterias, universities and hospitals are using Sodexo’s blended beef to prepare not only burgers, but lasagna, chili, meatballs, meatloaf and more. The company has adapted 30 popular recipes to use its mushroom blend.

“All those different things you can make with that product just like you would make with regular ground beef,” chef Morasco said.
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Chef Rob Morasco didn’t set out to make a planet-friendly burger.

But the 25 percent mushroom burger he created at food service company Sodexo not only has a lower carbon footprint, it’s also lower in calories, fat and salt.

It’s juicier, too.

“When you bite into it, it’s kind of like a flavor explosion,” Morasco said. “And you don’t taste the mushrooms, either.”

And because mushrooms are cheaper than beef, he could answer customer demand for antibiotic- and hormone-free burgers “without having to jack up the price,” he said.

Mushroom-blended burgers have been catching on among both chefs and environmentalists. In March, Sonic Drive-In became the first fast-food chain to offer them.

WATCH: These Burgers Are Better for the Planet, but You’d Never Know It

​2 million cars

Americans eat about 10 billion hamburgers each year, according to the World Resources Institute (WRI).

All those burgers take a toll on the planet.

Beef is “the most resource-intensive food that we commonly eat,” Richard Waite of WRI said.

Beef accounts for about half the greenhouse gases produced by the American diet, he added. Cows take far more feed, land and water than any other source of protein.

If every burger in America were blended with mushrooms, WRI estimates the greenhouse-gas savings would be like taking more than 2 million cars off the road.

It would save as much water as nearly 3 million American households use in a year. And it would reduce the demand for farmland by an area larger than the state of Maryland.

For the carnivore

Blended burgers are part of The Culinary Institute of America and Harvard T.H. Chan School of Public Health’s Menus of Change project, challenging chefs across the food industry to make their meals healthier and more sustainable.

Demand for meatless meals is growing along with rising health and environmental concerns. There are bean burgers, soy burgers, even beet-infused veggie burgers that “bleed.”

But it’s a limited market.

“The veggie burgers tend to cater to folks who identify as vegetarian or vegan, or actively want to be eating less meat,” Waite said.

On the other hand, blended burgers appeal to “the real carnivores, someone who really loves meat,” he added. “This is potentially a dish that could have broad mainstream appeal and also pretty big environmental benefits.”

Helps keep burgers juicy

Chefs say the mushrooms retain water, helping the burger stay juicy as it cooks.

Sonic Drive-In’s ads for its new Signature Slinger blended burger play up the juiciness and the lower calories.

“When you’re about something that is going to be better for you, it had better deliver the flavor first,” said Scott Uehlein, vice president for product innovation and development at Sonic Drive-In.

The company is piloting the burgers in a two-month trial run.

And the potential goes beyond burgers.

About 400 cafeterias, universities and hospitals are using Sodexo’s blended beef to prepare not only burgers, but lasagna, chili, meatballs, meatloaf and more. The company has adapted 30 popular recipes to use its mushroom blend.

“All those different things you can make with that product just like you would make with regular ground beef,” chef Morasco said.
…

As the world’s population heads toward 10 billion by midcentury, experts are wrestling with how to feed the world without wrecking the planet. It’s not easy to find foods with lower environmental impact that still taste as good as the ones they are intended to replace. But chefs and environmentalists are both cheering one new menu item: the mushroom-blended burger. VOA’s Steve Baragona has more.
…

As the world’s population heads toward 10 billion by midcentury, experts are wrestling with how to feed the world without wrecking the planet. It’s not easy to find foods with lower environmental impact that still taste as good as the ones they are intended to replace. But chefs and environmentalists are both cheering one new menu item: the mushroom-blended burger. VOA’s Steve Baragona has more.
…

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, 8.5-ton vehicle is expected to burn up on re-entry, although space agencies don’t know exactly 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 great 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 anyone on Earth being hit by debris is considered less than one in a trillion.

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.

​How common is man-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 U.S. 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 pieces of wreckage near the southwestern Australia city of Perth, which fined the U.S. $400 for littering.

The breakup on re-entry 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. 

What is Tiangong 1 and what was it used for?

Launched in 2011, Tiangong 1 was China’s first space station, serving as an experimental platform for bigger projects such as the Tiangong 2 launched in September 2016 and a future permanent Chinese space station.

The station, whose name translates as “Heavenly Palace,” played host to two crewed missions that included China’s first female astronauts and served as a test platform for perfecting docking procedures and other operations. Its last crew departed in 2013 and contact with it was cut in 2016. Since then it has been orbiting gradually closer and closer to Earth on its own while being monitored.

The station had two modules, one for its solar panels and engines, and one for a pair of astronauts to live in and conduct experiments. A third astronaut slept in the Shenzhou spaceships that docked with the station, which also contained facilities for personal hygiene and food preparation.

​How advanced is China’s space program?

Since China conducted its first crewed mission in 2003 — becoming only the third country after Russia and the U.S. to do so — it has taken on increasingly ambitious projects, including staging a spacewalk and landing its Jade Rabbit rover on the moon.

China now operates the Tiangong 2 precursor space station facility, while the permanent station’s 20-ton core module is due to be launched this year. The completed 60-ton station is set to come into full service in 2022 and operate for at least a decade.

China was excluded from the 420-ton International Space Station mainly due to U.S. legislation barring such cooperation and concerns over the Chinese space program’s strong military connections. China’s space program remains highly secretive and some experts have complained that a lack of information about Tiangong 1’s design has made it harder to predict what might happen upon its re-entry.

A mission to land another rover on Mars and bring back samples is set to launch in 2020. China also plans to become the first country to soft-land a probe on the far side of the moon.
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