振奋！登陆太阳指日可待…
July 5, 2018Cutting-Edge Heat Shield Installed on NASA’s Parker Solar Probe
The launch of Parker Solar Probe, the mission that will get closer to the Sun than any human-made object has ever gone, is quickly approaching, and on June 27, 2018, Parker Solar Probe’s heat shield — called the Thermal Protection System, or TPS — was installed on the spacecraft.
A mission 60 years in the making, Parker Solar Probe will make a historic journey to the Sun’s corona, a region of the solar atmosphere. With the help of its revolutionary heat shield, now permanently attached to the spacecraft in preparation for its August 2018 launch, the spacecraft’s orbit will carry it to within 4 million miles of the Sun's fiercely hot surface, where it will collect unprecedented data about the inner workings of the corona.https://www.nasa.gov/sites/default/files/styles/full_width/public/thumbnails/image/5d29748.jpg?itok=QU8WcQj5
Parker Solar Probe’s heat shield, called the Thermal Protection System, is lifted and realigned with the spacecraft’s truss as engineers from the Johns Hopkins Applied Physics Lab prepare to install the eight-foot-diameter heat shield on June 27, 2018.
Credits: NASA/Johns Hopkins APL/Ed Whitman
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https://www.nasa.gov/sites/default/files/styles/side_image/public/thumbnails/image/5d29803.jpg?itok=JVLrNgiH
The Thermal Protection System connects to the custom-welded truss on the Parker Solar Probe spacecraft at six points to minimize heat conduction.
Credits: NASA/Johns Hopkins APL/Ed Whitman
Download additional multimedia from NASA Goddard's Scientific Visualization Studio
https://www.nasa.gov/sites/default/files/styles/side_image/public/thumbnails/image/5d29486.jpg?itok=COaEKacl
Parker Solar Probe’s heat shield is made of two panels of superheated carbon-carbon composite sandwiching a lightweight 4.5-inch-thick carbon foam core. To reflect as much of the Sun’s energy away from the spacecraft as possible, the Sun-facing side of the heat shield is also sprayed with a specially formulated white coating.
Credits: NASA/Johns Hopkins APL/Ed Whitman
Download additional multimedia from NASA Goddard's Scientific Visualization Studio
The eight-foot-diameter heat shield will safeguard everything within its umbra, the shadow it casts on the spacecraft. At Parker Solar Probe’s closest approach to the Sun, temperatures on the heat shield will reach nearly 2,500 degrees Fahrenheit, but the spacecraft and its instruments will be kept at a relatively comfortable temperature of about 85 degrees Fahrenheit.The heat shield is made of two panels of superheated carbon-carbon composite sandwiching a lightweight 4.5-inch-thick carbon foam core. The Sun-facing side of the heat shield is also sprayed with a specially formulated white coating to reflect as much of the Sun’s energy away from the spacecraft as possible.
The heat shield itself weighs only about 160 pounds — here on Earth, the foam core is 97 percent air. Because Parker Solar Probe travels so fast — 430,000 miles per hour at its closest approach to the Sun, fast enough to travel from Philadelphia to Washington, D.C., in about one second — the shield and spacecraft have to be light to achieve the needed orbit.The reinstallation of the Thermal Protection System — which was briefly attached to the spacecraft during testing at the Johns Hopkins Applied Physics Lab in Laurel, Maryland, in fall 2017 — marks the first time in months that Parker Solar Probe has been fully integrated. The heat shield and spacecraft underwent testing and evaluation separately at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, before shipping out to Astrotech Space Operations in Titusville, Florida, in April 2018. With the recent reunification, Parker Solar Probe inches closer to launch and toward the Sun.
Parker Solar Probe is part of NASA’s Living with a Star Program, or LWS, to explore aspects of the Sun-Earth system that directly affect life and society. LWS is managed by Goddard for the Heliophysics Division of NASA’s Science Mission Directorate in Washington, D.C. The Johns Hopkins Applied Physics Laboratory manages the Parker Solar Probe mission for NASA. APL designed and built the spacecraft and will also operate it.
查资料得知，水星绕日轨道半长轴是36百万英里，而这个派克太阳观测台距离太阳仅仅是4百万英里。再努把力，不得了了啊:lol 金正恩：我们要登陆太阳，白天太热，我们晚上去。 没记错的话太阳表面温度是4000℃？现有材料站不住吧，而且还有辐射 论在太阳上挖煤的可行性 随着我们伟大祖国建设的飞速发展，能源问题日益突出，要发展，我们就要开发新的能量来源，在此，我郑重提出：向太阳进军！向太阳要能源！在太阳上挖煤！
本报告分三个部分:
第一部分：论太阳上有没有煤
一些资产阶级学者认为，组成太阳的主要元素是氢和氦，这简直是不明物理，乱说一通。我们随便找来一个充满氢气的气球，用火点燃它，气球确实会剧烈燃烧，但它持续的时间非常短暂，如果太阳是由氢和氦组成，氦气不会燃烧，而氢气在太阳上即使贮量再多，太阳燃烧的时间也决不会很长。
太阳也不会是由液体燃料组成。如果是液体，众所周知，液体具有流动性，那么这些组成太阳的液体会流满整个天空，我们看到的就不会是太阳这个火球燃烧，而是整个天空都在燃烧了。
所以组成太阳的既不会是气体，也不会是液体，而只能是固体。固体能燃烧的，有木柴和煤，然而前者燃烧时会发烟，但我们谁曾看见太阳冒着浓烟从天空掠过呢？所以组成太阳的主要物质只能是煤，而且是优质的无烟煤。
第二部分：论能不能挖太阳上的煤
资产阶级学者还鼓吹：“没有太阳，地球上就不会有风雪雨露，也不会有草木鸟兽。”甚至还说：“没有太阳，就没有我们这个美丽可爱的世界。”太阳的作用真的这样重要吗？太阳就真的如老虎屁股，一点儿也不能动吗？实践是检验真理的唯一标准！生活常识告诉我们：太阳，它只是在充满温暖和光明的白天发光，而在寒冷、黑暗、最需要光和热的时候，太阳，却不知躲到哪里去了！从这个意义上讲，太阳的作用甚至远远不及在黑夜里发微光的月亮。这些资产阶级的所谓学者抛出这种耸人听闻的太阳至上的论调其实别有用心，其目的在于阻挠别人对太阳上能源的开发利用。但他们忘记了任何伪科学的东西都是经不起推敲的，唯心的反动鼓吹其结果只能是在真理的厚墙上撞得头破血流。
第三部分：论如何在太阳上挖煤
我们都知道，太阳无时无刻不在燃烧，那么怎样才能在太阳上挖煤呢？要回答这个问题，笔者想先讲一讲自己年轻时的经历。那时笔者身在东北，三月植树节时响应号召植树造林。三月的北疆，土地尚未化冻，一镐抡下去，只能砸出一个白点。但困难吓不倒我们，我们砍倒大树生起了一堆堆篝火，让火把土地烤暖后移开它再挖。就这样边烧边挖，边挖边烧，终于胜利完成了光荣而艰巨的植树任务。
今天我们要在太阳上挖煤，就可以用到这个在激情燃烧的岁月中积累的宝贵经验。太阳上虽然燃烧着熊熊大火，但火不是可以用水来灭的么？难能可贵的是离太阳最近的一颗行星就是水星，水星水星，顾名思义，就是一颗充满了水的行星，那上面烟波浩淼，水资源可谓取之不尽，用之不竭。我们完全可以取水星之水局部地灭太阳之火，然后在已灭火的太阳局部表面上迅速地挖煤。就这样边挖煤边灭火，边灭火边挖煤。
虽然水星上水资源丰富，但本着节约的原则，我建议最好是利用早晨和黄昏这两个时间段搞生产。因为在这两个时间段里，太阳的温度不是很高，火势不是很猛，这时生产作业不但可以节约水资源，而且还提高了安全系数。并且在这两个时间段里，太阳离地表最近，也便于煤的运输，如果在正午生产，大大增加了水资源的消耗和提高了运输成本不说，如果煤块从高空跌落，还容易造成劳动人民生命财产的损失。
结语：不怕做不到，只怕想不到，只要我们解放思想，开动脑筋，一切东西都可以拿来为社会主义建设服务。正所谓：中华儿女多奇志，敢叫太阳变煤田！
;P 底下的有些评论是来搞笑的吧
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