Sealed behind the steel doors of two bunkers in a Beijing suburb, university students are trying to find out how it feels to live in a space station on another planet, recycling everything from plant cuttings to urine. "I'll get so much out of this," Liu Guanghui, a PhD student, who entered the bunker on Sunday, said. President Xi Jinping wants China to become a global power in space exploration, with plans to send the first probe to the dark side of the moon by 2018 and to put astronauts on the moon by 2036.