The threat from space rock 2024 YR4 has surpassed that of Apophis, an asteroid feared by scientists 20 years ago. The danger remains low, but experts are estimating the damage that could be done.

The threat of a newly discovered asteroid has risen slightly in the past few weeks, as the world’s telescopes rush to track its course. But the chance of an impact ... system's formation 4.6 ...

Perhaps more interesting than the raw chance of a hit is the change in that chance. Each time NASA checks, the number seems to creep ever higher — a couple tenths of a percent here, a few more ...

A collision with a medium-size asteroid could create widespread ... North America and northern South America. This “impact winter,” the researchers write, would disrupt photosynthesis ...