File photo released by NASA on Dec. 11, 2017 shows U.S. President Donald Trump (Front) signing the Space Policy Directive 1 at the White House in Washington D.C., the United States, on Dec. 11, 2017. Donald Trump on Monday signed his administration's first space policy directive, formally directing the U.S. space agency NASA to send astronauts back to the moon and eventually Mars. Jan. 20, 2018 reaches one-year mark for Donald Trump as the 45th president of the United States. One year into U.S. President Donald Trump's presidency, the uncertainties and anxieties over his unconventional playbook appear to have not diminished. As he seeks to implement his campaign promises, which seem controversial and even unacceptable to many, rifts, feuds and controversies dogged the year and 2018 would probably not be any different. (Xinhua/NASA/Aubrey Gemignani)