The Webb telescope is well-suited to identify asteroid 2024 YR4's size. Webb views a type of light we can't see with the naked eye, called infrared. Infrared light is largely heat energy, allowing Webb to observe the heat from distant objects, whether they're planets or distant galaxies.

NASA’s James Webb Space Telescope is being tapped to study an asteroid with a one-in-43 chance of colliding with Earth. On the slim chance it hits, experts say the impact could level a city or trigger tsunamis.

In a rare "time-critical" decision, the James Webb Space Telescope will study the true size of the "potentially hazardous" asteroid 2024 YR4 twice over the next few months. The asteroid has a roughly 2.