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Every time an Apollo astronaut walked off the moon and into his spacecraft, he tracked a load of dust with him.

But getting any sauce at all is a privilege of her position, one that few others on the spacecraft are afforded.

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.

This week, four astronauts took off to the ISS, where the spacecraft will pick up Williams and Wilmore before returning home.

The pair were due to be on the ISS for only eight days, but because of technical issues with the experimental spacecraft they came on, they have been there for more than nine months.