冰与火之歌第一季

NASA开始测试火星样本返回任务的防护罩_我的网站

A |     NASA一个设计防护罩的团队，正在保护美国宇航局的火星入地系统免受微陨石和空间碎片的影响。

B | 为了测试团队的防护罩和计算机模型，NASA一个实验室旨在安全地重现危险的撞击。    (ECNS) -- The 2026 Taiyuan Energy Low-Carbon Development Forum will be held from Sept. 4 to 5 in Taiyuan, north China's Shanxi Province, marking the 10th anniversary of the event.    Under the theme "Dual carbon goals drive energy transition, innovation accelerates a green future," the forum will focus on topics including renewable energy, new power systems, digital technologies and green finance.    More than 120 overseas guests from 28 countries and regions have confirmed their attendance, including government officials, diplomatic envoys, representatives of international organizations and executives from companies such as Tesla, Air Liquide and Siemens.    A key highlight of this year's forum will be the introduction of a dual guest-of-honor model for the first time. The United Kingdom will serve as the guest country of honor, with discussions focusing on the transition from coal-fired power generation to clean electricity systems.    China National Coal Group Corporation will meanwhile serve as the guest enterprise of honor, highlighting the role of major energy companies in driving technological innovation and industrial transformation.    Since its launch in 2016, the forum has been held nine times and attracted more than 1,300 international guests. Israel, Iceland, Mexico and Cuba are among the countries that have previously served as guests of honor.    During this year's event, participants will also have the opportunity to visit energy transition projects across Shanxi. A number of reports on energy technology, carbon neutrality and renewable energy development will also be released.                    。这个位于新墨西哥州拉斯克鲁斯NASA白沙测试设施的远程超高速测试实验室远离居民，被沙丘包围，为从航天飞机到阿尔特弥斯的每一个人类航天项目提供支持。该实验室还支持国际空间站（ISS）、商业乘员和商业补给项目的测试。
实验室使用2级光气枪将物体加速到每秒27500英尺（18750英里/小时）的速度，模拟微陨石和轨道碎片对航天器的影响。第一级使用火药作为推进剂，就像标准枪支那样。

C | 第二级使用高度压缩的氢气，将气体推入一个较小的管子，增加枪内的压力，就像汽车的活塞。火炮的压力变得如此之高，以至于如果它爆炸的话，会把建筑物夷为平地。工程师们花了三天时间为一个只持续一秒钟的实验做准备。他们使用了实验室的中型高压（50口径范围）2级轻气枪，以每秒16000至22000英尺（11000至15000英里/小时）的速度发射小弹丸。以这种速度，你可以在5分钟内从旧金山到纽约。虽然小球的速度快得令人难以置信，但微陨石在太空中的速度实际上是六到七倍。

D | 因此，该团队依靠计算机模型来模拟微陨石的实际速度。较慢的速度将测试计算机模型模拟对其防护罩设计的影响，并允许研究小组研究材料对这种能量的反应。火星样本返回是一项多任务活动，旨在将NASA"毅力"号探测器收集的经过科学选择的岩石和沉积物样本带回地球，将使科学家们能够使用最先进的实验室仪器对其进行研究，这些仪器将在未来十年和未来几十年内存在。这项活动是航天史上最雄心勃勃的努力之一，涉及多个航天器、多次发射和多个政府机构。NASA目前正在设计和开发将火星样品管送回地球的捕获、封闭和返回系统。

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