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Space Walks usually occur to repair, maintain, or build onto a station or satellite, Usually the ISS (International Space Station).
Every spacewalk (EVA) has a different purpose. Some of them are to attach new parts to the International Space Station and some are to repair it. Some of them are to repair the Hubbble Space Telescope.
russia
I believe it was launched from Russia!
They are brought there by America's Space Shuttle and Russia's Soyuz spacecraft.
Russia
The International Space Station (ISS). But its not just Russian and the US other countries contribute as well, although the US and Russia are the biggest.
The International Space Station (ISS).
Currently right now the International Space Station is the only space station in orbit. It has however been the only space station with such international participation that it can be really be considered international. Countries, including the US, have sent astronauts to Russia's former space station Mir. Just because the International Space Station is international, doesn't necessarily mean that every country uses it. Their are 15 countries that contribute to the ISS program including the US, Russia, Canada, Japan, and several European countries.
As of May 2014, the International Space Station is currently being operated by Russia, the United States, France, Japan, and Canada. It is used extensively for space research and development.
Because Russia was the only country with a permanent presence in space with Mir. Russia learnt a great deal with the successes and pitfalls of Mir. Most of the critical systems on the Iss are designed and built in Russia, in fact it's more of a Russian space station with international modules, but Russia will freely admit that America paid for it. America had several failed attempts at building their own spacestation, without the Russians it would never be up there.
It is the International Space Station.