An image of the Starliner landing.NASABoeing's Starliner spacecraft has safely returned to Earth — but without its astronauts.The spacecraft had suffered a number of issues with its thrusters and helium leaks.NASA said it decided to "prioritize safety and return Starliner without its crew."Boeing's Starliner spacecraft returned to Earth uncrewed after a three-month flight test to the International Space Station (ISS), NASA said on Saturday.The spacecraft successfully landed at the White Sands Space Harbor in New Mexico on September 6.The Starliner launched from Cape Canaveral in Florida on June 5 with NASA astronauts Butch Wilmore and Suni Williams on board, in what was intended to be a short eight-day mission dubbed the "Crew Flight Test."The mission was Starliner's final flight test and aimed to "validate the transportation system," with the astronauts checking its operational capabilities.But the Starliner craft ran into problems before it even reached the ISS, with NASA and Boeing identifying helium leaks and issues with its thrusters as it approached the space station."Following weeks of in-space and ground testing, technical interchange meetings, and agency reviews, NASA made the decision to prioritize safety and return Starliner without its crew," NASA said.