A multibillion-dollar contract between NASA and SpaceX is under scrutiny as the Elon Musk-helmed space company’s plans to return astronauts to the surface of the Moon keep slipping. Current and former NASA officials told the NYT that the concerns were not related to president Donald Trump and Musk’s deteriorated relationship. The test followed three significant test flight failures, each of which was ended with massive explosions. A crew of four astronauts will launch inside the agency’s Orion capsule atop a Space Launch System rocket, built by Boeing. However, most stages of the project have faced delays, including Orion and the Space Launch System.