Video: Orion countdown status briefing

The four RS-25 engines at the bottom of NASA’s first Space Launch System core stage shut down about a minute into a ground test-firing Saturday that was supposed to last more than eight minutes.

NASA hopes to have a new leader for the agency’s human spaceflight directorate by the end of the year to replace Bill Gerstenmaier, who held the post for nearly 14 years before his reassignment in July amid the Trump administration’s push to land humans on the moon by 2024, a NASA official said Wednesday.

NASA announced Monday it will order at least six reusable Orion crew capsules from Lockheed Martin for $4.6 billion to fly astronauts to the vicinity of the moon in the 2020s, and the agency said it plans to purchase hardware for up to 12 Orion vehicles by 2030.