Rear Adm. Kevin Smith was relieved from leadership of the program office by Dr. Brett Seidle, acting assistant secretary of the Navy for research, development and acquisition.

The admiral overseeing the Navy’s unmanned surface platforms and small combatants was relieved Tuesday, the service announced ...

The Navy has never gone this long without a fully empowered chief of naval operations. Former officials and analysts say the ...

“One key reason why the midcourse phase is difficult is because you’re in space, and different objects of different mass ...

In 2022, NASA scientists successfully nudged an asteroid off its course, shortening its orbit by 32 minutes as part of the Double Asteroid Redirection Test (DART) mission to test whether asteroids ...

In December, astronomers identified that the asteroid YR4 had a small but not insignificant chance of striking Earth in 2032, ...

a size that could be "a disaster of the scale of anything we've seen," according to Planetary Defense Officer Emeritus Lindley Johnson, who established the office in 2016. Another 11,266 NEOs have ...

a size that could be “a disaster of the scale of anything we’ve seen,” according to Planetary Defense Officer Emeritus Lindley Johnson, who established the office in 2016. Another 11,266 NEOs have ...

Space.com talked with Johnson, the space agency's Planetary Defense Officer Emeritus, now in phased retirement mode, about his decades of work in shaping a global response and reaction to a rocky ...

a planetary defense officer at NASA, told ABC News earlier this year. Its unique elongated orbit takes the asteroid around the sun and into Earth's vicinity before it ventures far out between the ...