Asteroid 2024 YR4 will not hit Earth, but it has forced planetary defense experts to confront a different kind of worst case: ...

NASA's next lunar mission is just around the corner, and three companies are competing to provide the rover that the ...

From its first detection using an instrument designed in part by teams based in the Bay, to follow-up orbit analysis ...

If an asteroid is on a collision course with the moon, what should humanity do? Try to nudge the space rock out of the way before it strikes? Obliterate it with a nuclear explosion? Such a cosmic ...