A 170-foot asteroid is set to race past Earth today at extraordinary speed, NASA says. Though no impact is expected, scientists are watching closely. What makes this flyby worth attention?

Asteroid 2024 YR4: More than 100 million people live in risk corridor, Nasa data shows - Asteroid’s destructive potential is 500 times the power of the atomic bomb dropped on Hiroshima ...

Planetary defense has moved from science fiction to a live engineering problem, and the stakes could not be higher. The central question is no longer whether an asteroid will eventually head our way, ...