1. NASA is set to announce whether the astronauts aboard the Boeing Starliner spacecraft will return to Earth on a SpaceX vehicle. The Starliner mission has faced several delays and technical issues, and NASA is exploring options to ensure the safe return of the crew. The decision to use a SpaceX vehicle would mark a significant shift in the agency's approach to crew transportation, as it has traditionally relied on multiple providers for such missions.

2. The Starliner spacecraft experienced a series of problems during its uncrewed test flight in 2019, leading to a delay in its first crewed mission. NASA and Boeing have been working to address these issues, but the timeline for the Starliner's return to flight remains uncertain. The agency is now considering the possibility of using a SpaceX Crew Dragon capsule to bring the Starliner's crew back to Earth, a move that would provide a backup plan in case the Starliner is unable to complete its mission.

3. The decision to use a SpaceX vehicle for the Starliner crew's return would be a significant development in the commercial crew program, which aims to establish reliable and cost-effective access to the International Space Station (ISS) for NASA astronauts. The program has seen both successes and challenges, with SpaceX's Crew Dragon emerging as a reliable and proven option, while the Starliner has faced ongoing technical hurdles. The announcement from NASA is expected to provide clarity on the path forward for the Starliner mission and the agency's approach to crew transportation.