Japanese astronaut Kimiya Yui and three colleagues returned to Earth from the International Space Station on Thursday, about a month earlier than planned, after a medical issue of one of the crew members cut the mission short, according to the U.S. space agency.The SpaceX spacecraft carrying the astronauts splashed down in waters off the coast of California after leaving the ISS. The four had spent about five months aboard the ISS conducting science experiments.According to NASA, one of the astronauts reported medical concerns on Jan. 7, prompting the cancellation of the following day's sch…READ FULL ARTICLE