By Douglas Whitbread Stunning photos from NASA ’s first untethered spacewalk have been released – as the agency prepares to celebrate the daring mission’s 40th anniversary. Brave astronaut Bruce McCandless II was pictured floating in space with only a jetpack to propel him after he had stepped out of his shuttle Challenger on February 7, 1984. Previous spacewalks had been completed using fastening, which ensured that those performing work on the ships were not unable to glide away. And McCandless remembered trying to ease the tension for both his fearful wife and those in Mission Control by ec…