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More presumed human remains recovered from submersible that imploded: Coast Guard_我的网站

一 |     The Coast Guard has recovered remaining debris, including presumed human remains, from a submersible that imploded on its way to explore the wreck of the Titanic, killing all five onboard, deep beneath the Atlantic Ocean's surface, officials said Tuesday.The Coast Guard said that the recovery and transfer of remaining parts was completed last Wednesday, and a photo showed the intact aft titanium endcap of the 22-foot (6.7-meter) vessel. Additional presumed human remains were carefully recovered from within Titan’s debris and transported for analysis by U.S. medical professionals, the Coast Guard said.The salvage mission conducted under an agreement with the U.S. Navy was a follow-up to initial recovery operations on the ocean floor roughly 1,600 feet (488 meters) away from the Titanic, the Coast Guard said. The new materials were offloaded at an unnamed port. The Coast Guard previously said it recovered presumed human remains along with parts of the Titan after the debris field was located at a depth of 12,500 feet (3,800 meters). Investigators believe the Titan imploded as it made its descent into deep North Atlantic waters on June 18. The multiday search mounted after Titan went silent captured attention around the world. The submersible was attempting to view the British passenger liner that sank in 1912.The Coast Guard’s Marine Board of Investigation said investigators from the U.S. National Transportation Safety Board and the Transportation Safety Board of Canada joined the salvage expedition, and the Coast Guard is coordinating with international investigative agencies to schedule a joint review of the evidence to determine the next steps for forensic testing.The Marine Board of Investigation, meanwhile, will continue its analysis and witness interviews ahead of a public hearing on the tragedy, officials said Tuesday.OceanGate, the operator of the vessel, has since gone out of business. Among those killed in the implosion was Stockton Rush, the submersible’s pilot and CEO of the company.。      夜空中的银河看似一张扁平、光滑的旋转圆盘，但实际上，这张“圆盘”并没有看上去那么简单。

二 | 中国科学院紫金山天文台科研团队在银河系分子气体外盘中首次发现广泛分布的波纹状褶皱结构。这一发现为理解银河系三维结构及其动力学演化提供了新的关键观测证据。相关研究成果8月7日发表在国际期刊《自然·天文学》上。

三 |   银河系的整体形状像一块受热变形的唱片，一侧向上翘起、另一侧向下弯曲。科学家把银河系的这种大尺度形变称为“翘曲结构”。然而，银河系中更细尺度的垂直结构是怎样的，长期缺乏系统性的观测与定量研究。  科研团队借助紫金山天文台建立在青海省海西蒙古族藏族自治州的13.7米毫米波望远镜“银河画卷”一氧化碳巡天数据，证认出3万余个外盘分子云。“我们对3万多个分子云进行了三维分析。”论文第一作者兼共同通讯作者、中国科学院紫金山天文台副研究员孙燕介绍，一氧化碳是追踪冷分子气体的重要“示踪剂”，而分子气体正是恒星形成的原料。  研究团队首先定量构建了银河系一氧化碳外盘的翘曲模型，拟合扣除大尺度翘曲背景后，发现背景结构中呈现清晰的波纹状垂直起伏，这些起伏被称为“褶皱”。  “褶皱表现为大片盘面整体向上或向下偏离，它们可能来自外部引力扰动激发的‘弯曲波’。”孙燕认为，“这很有可能是矮星系等卫星星系从银河系附近飞掠时，其引力对银河系产生了扰动，于是在银河系外盘中激起缓慢传播的‘涟漪’。”（记者金凤 张添福）。

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