Most comets that fly into the inner solar system seem to come from the outer region of the Oort cloud - a region of icy dust and debris left over from the birth of the solar system.

大部分飞入内太阳系的彗星似乎都来自奥特云的外部区域——奥特云是自太阳系诞生以来剩余的冰尘与残骸形成的区域。

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The US space agency's (Nasa) Associate Administrator for space Operations, Bill Gerstenmaier, said it was the closest a debris object had ever come to the station.

NASA的太空作业首席助理Bill Gerstenmaier说，这是太空残骸最接近国际空间站的一次。

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However, tracking data showed the debris would not come close enough to warrant an evacuation of the station, NASA said in a statement issued after the crew was given the all-clear signal.

然而，在空间站人员收到警报解除的信号之后，NASA发布了一份声明，称跟踪数据表明卫星碎片的距离不会接近到需要确保能进行空间站撤离的地步。

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If the piece of debris does come near the station, it will fire its thrusters to avoid it and will have several opportunities to do so.

FORBES: Progress 46 Successfully Docks With International Space Station

Earlier, it had said the debris might have come from two tires.

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In August, a room tag from the line's Maasdam cruise ship and sewage washed ashore in Lynn, Massachusetts, leading town officials to suggest the debris may have come from the ship.

CNN: Cruise ship fails CDC health inspection