説明
#thecosmosnews 'City-killer' asteroid has a 1-in-83 chance of smashing into Earth in 2032, NASA says A space rock dubbed 2024 YR4 has a 1.2% chance of smashing into our planet, scientists estimate.
Although the asteroid is currently moving away from us, Earth will have several close shaves with the space rock in the next half century. Its next sideswipe will occur in late 2028, followed by six more close approaches between 2032 and 2074. Of these, the one with the highest chance of impact will be on Dec. 22, 2032, according to NASA.
All of these factors place 2024 YR4 at Level 3 on the Torino Impact Hazard Scale, the system scientists use to determine an asteroid's threat level. For objects at this level, "attention by public and by public officials is merited if the encounter is less than a decade away." However, most asteroids in this category are eventually downgraded to Level 0, which means "the likelihood of a collision is zero, or is so low as to be effectively zero."