What asteroid's collision with the moon could create a flash visible from Earth, according to a February 2026 study?

The asteroid 2024 YR4 was at the center of scientific discussions around February 2026 regarding a potential collision with the Moon that could have produced a flash visible from Earth. This celestial body, estimated to be around 60 meters (200 feet) across, garnered significant attention due to its initially uncertain trajectory, which at one point suggested a notable chance of striking our natural satellite in 2032.

Before definitive observations, a study released in January 2026 explored the dramatic implications of such an impact. It predicted that if 2024 YR4 were to hit the Moon, the event could create a bright flash on the lunar surface, potentially reaching a magnitude that would make it visible to the naked eye from Earth, especially if it occurred on the unlit portion of the Moon. This hypothetical impact was also theorized to launch lunar debris, some of which might even reach Earth and be observable as meteors in our night sky. The possibility highlighted the scientific value of observing such a rare event firsthand.

However, the scenario of a lunar impact by 2024 YR4 was ultimately ruled out by refined trajectory calculations. Observations made by the James Webb Space Telescope (Deals) in February 2026, utilizing its sensitive infrared instruments, allowed astronomers to precisely track the asteroid. These crucial observations confirmed that 2024 YR4 would safely pass by the Moon at a distance of over 21,200 kilometers (13,200 miles), eliminating any risk of collision. Despite the averted impact, the extensive study and monitoring of 2024 YR4 provided invaluable experience in planetary defense and demonstrated the advanced capabilities of modern astronomical observatories.