Three Chinese taikonauts returned to Earth on Monday from their mission on the Tiangong (Heavenly Palace) space station after six months in space. The space capsule of commander Ye Guangfu, Li Cong and Li Guangsu landed in the northern province of Inner Mongolia, according to Chinese state news agency Xinhua. The crew had taken off in their Shenzhou 18 spacecraft at the end of April to carry out maintenance work and various scientific experiments. In May, they completed the longest spacewalk ever undertaken by China. China sent a new three-member crew to its space station at the end of October…