The crew of the International Space Station briefly took refuge in escape capsules as a piece of space junk drifted nearby.
The debris - a discarded piece of Russian rocket - was detected yesterday when it was too late to move the ISS
NASA said the debris was barely close enough to be a threat but that precautionary measures had to be taken.
It is the third time in 12 years that the ISS has faced a possible collision with space junk.
In June, a piece of debris came within 335m of the platform.
The ISS is currently manned by three Russians, two Americans and a Japanese astronaut.