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Until 2011, astronauts flew on space shuttles to conduct research in space and travel to the International Space Station (ISS). NASA is currently working with Lockheed Martin to develop a space shuttle replacement, the Orion Multi-Purpose Crew Vehicle. Astronauts will eventually use Orion to travel to the ISS, conduct research in space, and travel to the moon, Mars, asteroids, and other destinations. Until then, they are being ferried to the International Space Station by the Russian space program.