Though no known asteroids pose an existential threat to the planet right now, scientists are on the lookout for any hazardous near-Earth objects. Even smaller rocks can be disastrous. In 2013, an undetected meteor exploded over Chelyabinsk, Russia, causing an airburst and shockwave that injured 1,600 people. The culprit was only 60 feet wide.
The first day of the Iran war was the deadliest, an independent monitoring group says。业内人士推荐新收录的资料作为进阶阅读
Фото: Alina Smutko / Reuters。关于这个话题，新收录的资料提供了深入分析
Copyright © 1997-2026 by www.people.com.cn all rights reserved