The mission has already faced years of delays, and Nasa is under pressure to get the astronauts on their way as soon as possible. However, the US space agency said it would not compromise on safety.
Throughout their mission there have always been spacecraft attached to the space station to get them - and the rest of those onboard - home if there was an emergency.
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Rebecca Morelle,Science Editorand
湖北宜昌市，三峡大坝及三峡电站输电设施。