The Japanese billionaire who will head off into space on one of Elon Musk's rockets says he "trusts" him, despite the various problems he has run into. Mr Musk has been repeatedly criticised for sending joking tweets that launched a federal investigation, for promoting unfounded allegations against the British diver who helped save children from an underground cave, and further personal troubles. But Yusaku Maezawa said he respects and trusts his fellow billionaire and that he is looking forward to the trip. "Twitter can get you into trouble," Maezawa, chief executive of Zozo Inc, said Tuesday at the Foreign Correspondents' Club in Tokyo. "And that can be said of Elon Musk, too."