NASA is canceling the AXIS X-ray space telescope mission concept, saying it failed to meet key requirements. But the project leader thinks there's another reason.

NASA has disqualified one of the two proposals for a large astrophysics mission, a decision the project’s leader blames on ...

As the first major piloted NASA X-plane to fly in a generation and the first crewed, purpose-built U.S. high-speed research aircraft since the X-15 of the 1960s, the X-59 low-boom ...

NASA has revealed more detail about the recent first flight of its X-59 Quesst supersonic demonstrator jet, a milestone the agency describes as demonstrating its continued ability to manage ...

NASA's X-59 successfully reduced sonic booms from thunder-level 105 decibels to whisper-quiet 75 decibels, potentially ending the 50-year supersonic flight ban.

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