The claim

““NASA has issued a warning that a ‘city-killer’ asteroid could hit Earth in 2029.””

NASA has not issued an impact warning for 2029; the well-known 2029 close approach of asteroid Apophis is expected to be a safe flyby.

This claim commonly circulates by conflating legitimate asteroid-tracking updates with sensational language like “warning” and “city-killer.” NASA’s Center for Near-Earth Object Studies and related monitoring pages indicate that 99942 Apophis will pass Earth on April 13, 2029 at a close but non-impacting distance (a noteworthy flyby that will be visible in parts of the world). Modern orbit determinations and continuous observations have ruled out an Earth impact in 2029 for Apophis, and NASA’s public communications describe it as a close approach rather than an imminent strike. While small changes in asteroid orbits can occur over time (e.g., via gravitational effects), the specific statement that NASA warned of a 2029 impact is not supported by NASA’s own tracking information.