Question is why Astronauts need to learn Russian Before going to ISS? Astronaut’s missions commanded by Russians to the ISS (International Space Station) on a Soyuz spacecraft. And other than NASA, the Russian space agency is the biggest in the world so operations and modules on the ISS are mostly in Russian.
Some of the cosmonauts are also Russian so Astronauts need to learn Russian.
Astronauts also have to learn Japanese and European to understand the technical systems.
All Astronauts don’t need to learn Russian. Astronauts and cosmonauts that are trained to work on International Space Station must learn English and Russian, it doesn’t matter what ship they are. While working on ISS you must need to learn both languages.
For private astronauts, it is not necessary to learn Russian. If the latest Astronaut candidates’ class will not be trained to work on ISS, then they don’t need to learn Russian.
The commander of the ship is always a Russian while the foreigner astronaut becomes commander of the ISS. Russian gets all his commands in his language which compels foreigners to learn Russian.
Slow down, Speed up/accelerate, Switch over to manual mode, Damp rate/velocity, Issue the signal, Monitor the propellant consumption, brake, perform deorbit burn are some of the common commands they are given in Russian. The Russian books for understanding the language contains hundreds of pages of commands.
Can Astronauts Return to Earth without Russia?
If the relations between America and Russia deteriorate due to some reasons as happened in the past many times.
So, what would happen to the astronauts Americans have in space right now? Will America be able to bring them back?
The answer is no. The US will not be able to bring its astronauts back without Russian help.
But Russia will never mix politics with science and this will never happen. As Russian space agencies have foreigners so they will object. And Americans pay for what they get. At last, the Russian Space Agency cares about science and not politics.
Does Time Exist in Space? Do Astronauts Age Slower than on Earth?