Aboard the International Space Station, an A4-size flag of the United States hangs next to a 1:100 model of a space shuttle. The memento, placed there by the last crew to fly on shuttle Atlantis, is meant to be retrieved by the next batch of astronauts that launches on a US spacecraft. NASA had hoped to reach that goal in 2017 after awarding Boeing and SpaceX billion-dollar contracts under the Commercial Crew Program (CCP). However, the road back to manned missions is paved with thorn…Read more