A strange pulsing sound has been heard from Boeing’s troubled Starliner spacecraft, prompting a concerned comment from seasoned astronaut Chris Hadfield. Astronauts Suni Williams and Butch Wilmore departed for the International Space Station (ISS) on June 5, the third and final test of Boeing’s new Starliner capsule, and its first launch with a crew. The mission was only expected to last for eight days – but due to problems with Starliner’s thrusters and a helium leak, the two remain stranded on the space station nearly three months later. It had been hoped that the spacecraft could be fixed a…