Економіка

Three Chinese astronauts landed in a northern desert on Sunday after six months working to complete construction of the Tiangong station, a symbol of the country’s ambitious space program, state TV reported.

A capsule carrying commander Chen Dong and astronauts Liu Yang and Cai Xuzhe touched down at a landing site in the Gobi Desert in northern China at approximately 8:10 p.m. (1210 GMT), China Central Television reported.

Prior to departure, they overlapped for almost five days with three colleagues who arrived Wednesday on the Shenzhou-15 mission for their own six-month stay, marking the first time China had six astronauts in space at the same time. The station’s third and final module docked with the station this month.

The astronauts were carried out of the capsule by medical workers about 40 minutes after touchdown. They were all smiles, and appeared to be in good condition, waving happily at workers at the landing site.

“I am very fortunate to have witnessed the completion of the basic structure of the Chinese space station after six busy and fulfilling months in space,” said Chen, who was the first to exit the capsule. “Like meteors, we returned to the embrace of the motherland.”

Liu, another of the astronauts, said that she was moved to see relatives and her fellow compatriots.

The three astronauts were part of the Shenzhou-14 mission, which launched in June. After their arrival at Tiangong, Chen, Liu and Cai oversaw five rendezvous and dockings with various spacecraft including one carrying the third of the station’s three modules.

They also performed three spacewalks, beamed down a live science lecture from the station, and conducted a range of experiments.

The Tiangong is part of official Chinese plans for a permanent human presence in orbit.

China built its own station after it was excluded from the International Space Station, largely due to U.S. objections over the Chinese space programs’ close ties to the People’s Liberation Army, the military wing of the ruling Communist Party.

With the arrival of the Shenzhou-15 mission, the station expanded to its maximum weight of 100 tons.

Without attached spacecraft, the Chinese station weighs about 66 tons — a fraction of the International Space Station, which launched its first module in 1998 and weighs around 465 tons.

With a lifespan of 10 to 15 years, Tiangong could one day be the only space station still up and running if the International Space Station retires by around the end of the decade as expected.

China in 2003 became the third government to send an astronaut into orbit on its own after the former Soviet Union and the United States.

China has also chalked up uncrewed mission successes: Its Yutu 2 rover was the first to explore the little-known far side of the moon. Its Chang’e 5 probe also returned lunar rocks to Earth in December 2020 for the first time since the 1970s, and another Chinese rover is searching for evidence of life on Mars.

Officials are reported to be considering an eventual crewed mission to the moon, although no timeline has been offered.
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With Ukraine scrambling to keep communication lines open during the war, an army of engineers from the country’s phone companies has mobilized to help the public and policymakers stay in touch during repeated Russian missile and drone strikes.

The engineers, who typically go unseen and unsung in peacetime, often work around the clock to maintain or restore phone service, sometimes braving minefields to do so. After Russian strikes took out the electricity that cellphone towers usually run on, they revved up generators to keep the towers on.

“I know our guys – my colleagues – are very exhausted, but they’re motivated by the fact that we are doing an important thing,” Yuriy Dugnist, an engineer with Ukrainian telecommunications company Kyivstar, said after crunching through 15 centimeters of fresh snow to reach a fenced-in mobile phone tower on the western fringe of Kyiv, the capital.

Dugrist and his coworkers offered a glimpse of their new daily routines, which involve using an app on their own phones to monitor which of the scores of phone towers in the capital area were receiving electricity, either during breaks from the controlled blackouts being used to conserve energy or from the generators that kick in to provide backup power.

One entry ominously read, in English, “Low Fuel.”

Stopping off at a service station before their rounds, the team members filled up eight 20-liter jerrycans with diesel fuel for a vast tank under a generator that relays power up a 50-meter cell tower in a suburban village that has had no electricity for days.

It’s one of many Ukrainian towns that have had intermittent power, or none at all, in the wake of multiple rounds of devastating Russian strikes in recent weeks targeting the country’s infrastructure – power plants in particular.

Kyivstar is the largest of Ukraine’s three main mobile phone companies, with some 26 million customers – or the equivalent of about two-thirds of the country’s population before Russia’s Feb. 24 invasion drove millions of people abroad, even if many have since returned.

The diesel generators were installed at the foot of the cell phone towers since long before the invasion, but they were rarely needed. Many Western countries have offered up similar generators and transformers to help Ukraine keep electricity running as well as possible after Russia’s blitz.

After emergency blackouts prompted by a round of Russian strikes on Nov. 23, Kyivstar deployed 15 teams of engineers simultaneously and called in “all our reserves” to troubleshoot the 2,500 mobile stations in their service area, Dugrist said.

He recalled rushing to the site of a destroyed cell tower when Russian forces pulled out of Irpin, a suburb northwest of Kyiv, earlier this year and getting there before Ukrainian minesweepers had arrived to give the all-clear signal.

The strain the war is putting on Ukraine’s mobile phone networks has reportedly driven up prices for satellite phone alternatives like Elon Musk’s Starlink system, which Ukraine’s military has used during the conflict, now in its 10th month.

After widespread infrastructure strikes last week, Ukrainian President Volodymyr Zelenskyy convened top officials to discuss the restoration work and supplies needed to safeguard the country’s energy and communication systems.

“Special attention is paid to the communication system,” he said, adding that no matter what the Russia has in mind, “we must maintain communication.”
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Tech billionaire Elon Musk said his Neuralink company is seeking permission to test its brain implant in people soon.

In a “show and tell” presentation livestreamed Wednesday night, Musk said his team is in the process of asking U.S. regulators to allow them to test the device. He said he thinks the company should be able to put the implant in a human brain as part of a clinical trial in about six months, though that timeline is far from certain.

Musk’s Neuralink is one of many groups working on linking brains to computers, efforts aimed at helping treat brain disorders, overcoming brain injuries and other applications.

The field dates to the 1960s, said Rajesh Rao, co-director of the Center for Neurotechnology at the University of Washington. “But it really took off in the ’90s. And more recently we’ve seen lots of advances, especially in the area of communication brain computer interfaces.”

Rao, who watched Musk’s presentation online, said he doesn’t think Neuralink is ahead of the pack in terms of brain-computer interface achievements. “But … they are quite ahead in terms of the actual hardware in the devices,” he said.

The Neuralink device is about the size of a large coin and is designed to be implanted in the skull, with ultra-thin wires going directly into the brain. Musk said the first two applications in people would be restoring vision and helping people with little or no ability to operate their muscles rapidly use digital devices.

He said he also envisions that in someone with a broken neck, signals from the brain could be bridged to Neuralink devices in the spinal cord.

“We’re confident there are no physical limitations to enabling full body functionality,” said Musk, who recently took over Twitter and is the CEO of Tesla and SpaceX.

In experiments by other teams, implanted sensors have let paralyzed people use brain signals to operate computers and move robotic arms. In a 2018 study in the journal PLOS ONE, three participants with paralysis below the neck affecting all of their limbs used an experimental brain-computer interface being tested by the consortium BrainGate. The interface records neural activity from a small sensor in the brain to navigate things like email and apps.

A recent study in the journal Nature, by scientists at the Swiss research center NeuroRestore, identified a type of neuron activated by electrical stimulation of the spinal cord, allowing nine patients with chronic spinal cord injury to walk again.

Researchers have also been working on brain and machine interfaces for restoring vision. Rao said some companies have developed retinal implants, but Musk’s announcement suggested his team would use signals directly targeting the brain’s visual cortex, an approach that some academic groups are also pursuing, “with limited success.”

Neuralink did not immediately respond to an email to the press office. Dr. Jaimie Henderson, a neurosurgery professor at Stanford University who is an adviser for Neuralink, said one way Neuralink is different from some other devices is that it has the ability to reach into deeper layers of the brain. But he added: “There are lots of different systems that have lots of different advantages.”
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