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Orion was originally envisioned to be part of the Constellation program, NASA's successor to the space shuttles. The 21,000-pound (9,500-kg) capsule would have been used to send astronauts back to the moon and to ferry people and supplies to and from the International Space Station. However, in his 2011 budget proposal, President Barack Obama called for canceling Constellation and urged NASA to work instead toward sending humans to an asteroid, then to Mars.