Three Chinese taikonauts have returned to Earth from their mission on the Tiangong (Heavenly Palace) space station after six months in space. The space capsule of commander Tang Hongbo, Tang Shengjie and Jiang Xinlin landed in the northern province of Inner Mongolia on Tuesday evening, Chinese state television reported. The crew had taken off in their Shenzou (Divine Vessel) 17 spacecraft at the end of October last year to carry out maintenance work on the station after it had been damaged by debris. The men were relieved by another three man crew, from the current Shenzhou 18 mission, who are…