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Russia's announcement this week that it will leave the International Space Station "after 2024" raises critical questions about the outpost's future viability.
Here's what you should know about Moscow's decision, and the potential effect on one of the last remaining examples of US-Russia cooperation.
- Why does Russia want to leave? -
Russia's invasion of Ukraine has pitted it against the West, eviscerating its relationship with the United States and leading to broad sanctions, including against its space industry.
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The module is the second of three launched so far as Beijing hopes to complete its space station by the end of the year.The 23-tonne laboratory module – called Wentian, which means “quest for the heavens” – was carried into space by China’s most powerful rocket, the Long March 5B, following a 2:22pm (6:22 GMT) launch aired live on the state broadcaster CCTV on Sunday.
Back in March, Dmitry Rogozin, then-chief of Russian space agency Roscosmos, warned that without his nation's cooperation, the ISS could plummet to Earth on US or European territory.
But Rogozin's penchant for bombast, combined with a lack of a firm plan, left things uncertain -- and just two weeks ago, Russia and the United States vowed to continue flying each other's cosmonauts and astronauts to the station.
Scott Pace, director of the Space Policy Institute at George Washington University, said that if anything, the new announcement by Rogozin's successor Yury Borisov was "mildly helpful."
"The fact they said, 'We're going to be committed through 2024' is good," Pace, a former high-ranking government official, told AFP.
Russia to quit International Space Station ‘after 2024’
Roscosmos chief says space agency will focus on creating its own orbital outpost as it exits multilateral project.“Of course, we will fulfil all our obligations to our partners, but the decision to leave this station after 2024 has been made,” Roscosmos Director General Yury Borisov told Russian President Vladimir Putin in comments released by the Kremlin on Tuesday.
It means Moscow isn't planning to pull out sooner, even though what precisely is meant by "after 2024" isn't yet clear.
The year 2024 is what the partners had previously agreed to, though NASA's goal is to keep the ISS in orbit until at least 2030 and then transition to smaller commercial stations.
The next step in the process is to notify a body called the multilateral control board, comprising all the ISS partners -- the United States, Russia, Europe, Japan and Canada -- at which point details of the transition will be defined.
If Russia does follow through, it could end up grounding its once proud space program for some time. The country doesn't have a commercial space economy, and Russian analysts don't see the country building a new station anytime soon.
- Can the station fly without Russia? -
Probably -- but it would be challenging.
Video: 'It's an opportunity for NASA': Russia announces ISS withdrawal (Reuters)
Russia announces to leave the international space station without warning NASA
The ISS was launched in 1998 at a time of hope for US-Russia cooperation following their Space Race competition during the Cold War.
Since the Space Shuttle was retired, the ISS has relied on Russian propulsion systems for periodic boosts to maintain its orbit, some 250 miles (400 kilometers) above sea level. The US segment is responsible for electricity and life support systems.
The United States has recently taken strides in gaining an independent propulsion system through Northrop Grumman's Cygnus spacecraft, which successfully carried out a re-boost test in late June.
But altitude is only a part of the equation: the other is "attitude," or orientation.
Cygnus "can push, but it can't keep the station pointed in the right direction while it pushes," explained astronomer and space watcher Jonathan McDowell.
The ISS itself can make small attitude adjustments, but if the Russians pulled out, the United States would need a more permanent solution -- perhaps involving the SpaceX Dragon, Northrop Grumman's Cygnus or Orion, said Pace.
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Russia has two propulsion systems: progress spaceships that dock to the station and the Zvezda service module. All of the control systems are handled out of Moscow.
It would be helpful if Russia left their segment in place rather than took it with them when they go -- one of the station's two bathrooms are on the Russian side -- observed Pace, but that's another unknown.
"If it's still there, and we wanted to use it, would there be some sort of rental arrangement? I don't know."
- What do experts predict? -
NASA itself has adopted a bullish position.
"We're running and gunning, we're gonna go to 2030 full up," Joel Montalbano, NASA ISS program manager, said Tuesday on the morning of the Russian announcement.
"Anybody thinks that there's a different plan, you're wrong."
But while Russia's withdrawal could present a new opportunity for the private sector, McDowell isn't so certain.
For him, "how hard they really want to work to get an extra few years out of ISS" is an open question.
"It's maybe not the right move for the US to go to extreme lengths to save (the) Station," he said, especially since NASA has bigger goals of building a lunar space station called Gateway, establishing a Moon presence and going to Mars.
"Maybe they should take the Russian pull-out as an excuse, and go, 'Okay, bye.' And now let's put our money in Gateway."
The Ukrainian Muslims fighting against Russia .
Those who have joined the war effort against Russian forces also fight past injustices and to return to Crimea.Since Russia’s full-scale invasion began in February, Khadzali has worked with a team of six volunteers to provide humanitarian assistance and evacuate people from areas hit hard by the fighting.