In emergency decision, James Webb telescope will study 'city-killer' asteroid 2024 YR4 before its close approach to Earth

In emergency decision, James Webb telescope will study 'city-killer' asteroid 2024 YR4 before its close approach to Earth

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 ...