The toilet of the international space station is broken

The mission control station on ISS said the astronauts had to hang the 'not serving' sign until the toilet was repaired.

Space shuttle astronauts Endeavor, currently on ISS, must use the toilet of his ship. Residents on ISS are using an extra toilet in the Russian part on ISS.

ISS, worth $ 100 billion, has encountered problems due to toilet problems.

According to NASA, if the toilet cannot be repaired, the urine bags so far will float everywhere. ' We don't know how serious the problem is now, ' said flight operator Brian Smith. But he also stressed that existing toilet malfunctions ' won't be a big deal '.

Poor waste system?

The main toilet of ISS, a multi-million dollar system built by Russia, was installed and installed on the American side of the station last year. Previously, it was broken once, forcing Discovery to transfer to another replacement waste pipe in 2008.

A controversy over the toilet problem arose earlier this year, when a Russian astronaut complained that he was no longer using US toilets because of cost issues and other problems.

But despite the ' stress of the kitchen ', astronauts attempted to transfer the ' goods ' on the shuttle Endeavor to ISS yesterday, the second day of Endeavor's 11-day mission.

NASA is also investigating why Endeavor's fuel tank is torn with a large array of insulating sponges during launch.