Nasa astronauts Sunita Williams and Butch Wilmore have successfully returned to Earth after an unplanned nine-month extension of their mission aboard the International Space Station (ISS). The mission, initially scheduled for just eight days, was prolonged due to propulsion issues with the Boeing Starliner spacecraft they were testing. Their spacecraft, SpaceX’s Dragon Freedom capsule, successfully splashed down off the coast of Florida near Tallahassee at 5:57 pm ET on Tuesday (3:27 am IST, Wednesday).