It’s launch day for four astronauts who will soon be on their way to the International Space Station. The otherwise routine flight will be closely watched because it kicks off a series of events culminating in NASA astronauts Suni Williams and Butch Wilmore’s long-awaited trip back to Earth. Williams and Wilmore were expected to stay on the ISS for just a week as part of the first crewed test flight of Boeing’s Starliner spacecraft, but problems with the vehicle forced them to remain in orbit,