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Webb telescope's latest observationsTracking Asteroid 2024 YR4 again this year required some ingenuity. Many astronomers believed they wouldn't get another chance until 2028, but an international team identified two short windows last month — Feb. 18 and 26 — when Webb might still detect the space rock. The telescope observes only a small patch of sky at a time, so astronomers had to predict the asteroid's position with extreme accuracy to point the instrument correctly.
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Европеец описал впечатления от дворца в России фразой «рот открылся и не закрывался»17:34，推荐阅读whatsapp获取更多信息
但同济大学附属上海市肺科医院的研究发现，人造石英石矽肺患者的病程更短。研究调查了86名人造石英石矽肺患者的临床特诊和作业环境，发现患者们接触粉尘二氧化硅含量高达70%—99%，平均接尘工龄5.6年，远远短于传统矽肺。“如此短的接触工龄，部分患者初诊就已达到矽肺二期甚至三期”。