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"The Soyuz has been through its history very reliable and there has obviously been some issue in the last couple of descents which went ballistic, but I'm sure the engineers will determine what the problems are and get them fixed," she said.
In October, a Soyuz capsule carrying Malaysia's first space tourist touched down about 200 km (125 miles) off course in a similar ballistic landing caused by a technical problem.
The Soyuz is the world's longest-serving manned space capsule. An early version of the craft, the Vostok, carried the first person into space in 1961.
Whitson, 48, has become the American with the longest amount of time in space with 377 days.
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