Explained: Why Sunita Williams' Boeing Starliner flight got postponed?

The Boeing Starliner's lift-off, which was to take astronaut Sunita Williams to space for a third time, has been postponed due to a technical glitch. Williams and Nasa's Barry Wilmore, who could have marked the Starliner's first crewed flight to the International Space Station, are now awaiting a second launch attempt. Watch the video to know more.