Crew of U.S. Polaris Dawn mission have completed a spacewalk on Thursday, marking the first time commercial astronauts have space-walked from a commercial spacecraft, according to SpaceX.The spacewalk started at around 6:13 a.m. Eastern Time (1013 GMT). Two astronauts of the four-member all-civilian crew wore the SpaceX-newly-designed extravehicular activity suits for the spacewalk.The two astronauts are American billionaire entrepreneur Jared Isaacman and SpaceX engineer Sarah Gillis.Isaacman and Gillis each spent several minutes outside the capsule. The spacewalk ended at about 7:59 a.m. (1159 GMT).SpaceX launched the new fully-commercial human spaceflight mission on a Dragon spacecraft from NASA's Kennedy Space Center in Florida on Tuesday.The spacecraft has travelled to a distance of 1,400 km above Earth on Wednesday -- the farthest humans have travelled since the Apollo program over 50 years ago, according to SpaceX.The crew are also scheduled to conduct science during their multi-day missio n to orbit, including essential health and human performance research for NASA's Human Research Program. EnditemSource: The Namibia News Agency