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5 space missions racing to stop a 'city-killer' asteroid

Asteroid 2024 YR4, a roughly 180 foot wide rock initially labeled a “city killer,” has focused attention on how quickly a ...
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James Webb telescope takes emergency look at 'city-killer' asteroid 2024 YR4 ahead of close encounter in 2032

The powerful James Webb Space Telescope (JWST) has just completed the first of two planned observations of the infamous "city-killer" asteroid 2024 YR4, which will make a perilously close approach to ...