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サマリー
あらすじ・解説
The European Space Agency (ESA) is closely monitoring near-Earth asteroid 2024 YR4, which poses a small but non-zero chance of impacting Earth in 2032. Currently estimated to be 40-100 meters wide, the asteroid has a 1.2% probability of impact according to ESA, a figure corroborated by NASA. This risk level has triggered the activation of two UN-endorsed international groups—the International Asteroid Warning Network (IAWN) and the Space Mission Planning Advisory Group (SMPAG)—to coordinate observation efforts and plan potential mitigation strategies.
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