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NASA spacecraft launched to mysterious and rare metal asteroid_我的网站

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A | CAPE CANAVERAL, Fla. -- NASA’s Psyche spacecraft rocketed away Friday on a six-year journey to a rare metal-covered asteroid.Most asteroids tend to be rocky or icy, and this is the first exploration of a metal world. Scientists believe it may be the battered remains of an early planet's core, and could shed light on the inaccessible centers of Earth and other rocky planets.SpaceX launched the spacecraft into an overcast midmorning sky from NASA’s Kennedy Space Center. Named for the asteroid it’s chasing, Psyche should reach the huge, potato-shaped object in 2029.“It's so thrilling,” said Laurie Leshin, director of NASA’s Jet Propulsion Laboratory. Added Arizona State University's Jim Bell, part of the Psyche team: “What a great ride so far.”An hour later, the spacecraft separated successfully from the rocket's upper stage and floated away, drawing applause from ground controllers.After decades of visiting faraway worlds of rock, ice and gas, NASA is psyched to pursue one coated in metal. Of the nine or so metal-rich asteroids discovered so far, Psyche is the biggest, orbiting the sun in the outer portion of the main asteroid belt between Mars and Jupiter alongside millions of other space rocks. It was discovered in 1852 and named after Greek mythology’s captivating goddess of the soul.“It’s long been humans’ dream to go to the metal core of our Earth. I mean, ask Jules Verne,” lead scientist Lindy Elkins-Tanton of Arizona State University said ahead of the launch. “The pressure is too high. The temperature is too high. The technology is impossible,” she said. “But there’s one way in our solar system that we can look at a metal core and that is by going to this asteroid.”Astronomers know from radar and other observations that the asteroid is big — about 144 miles (232 kilometers) across at its widest and 173 miles (280 kilometers) long. They believe it’s brimming with iron, nickel and other metals, and quite possibly silicates, with a dull, predominantly gray surface likely covered with fine metal grains from cosmic impacts.Otherwise, it’s a speck of light in the night sky, full of mystery until the spacecraft reaches it after traveling more than 2 billion miles (3.6 billion kilometers).Scientists envision spiky metal craters, huge metal cliffs and metal-encrusted eroded lava flows greenish-yellow from sulfur — “almost certain to be completely wrong,” according to Elkins-Tanton. It's also possible that trace amounts of gold, silver, platinum or iridium — iron-loving elements — could be dissolved in the asteroid's iron and nickel, she said. “There's a very good chance that it’s going to be outside of our imaginings, and that is my fondest hope," she said.Believed to be a planetary building block from the solar system’s formation 4.5 billion years ago, the asteroid can help answer such fundamental questions as how did life arise on Earth and what makes our planet habitable, according to Elkins-Tanton.On Earth, the planet's iron core is responsible for the magnetic field that shields our atmosphere and enables life.Led by Arizona State University on NASA’s behalf, the $1.2 billion mission will use a roundabout route to get to the asteroid. The van-size spacecraft with solar panels big enough to fill a tennis court will swoop past Mars for a gravity boost in 2026. Three years later, it will reach the asteroid and attempt to go into orbit around it, circling as high as 440 miles (700 kilometers) and as close as 47 miles (75 kilometers) until at least 2031.The spacecraft relies on solar electric propulsion, using xenon gas-fed thrusters and their gentle blue-glowing pulses. An experimental communication system is also along for the ride, using lasers instead of radio waves in an attempt to expand the flow of data from deep space to Earth. NASA expects the test to yield more than 10 times the amount of data, enough to transmit videos from the moon or Mars one day.The spacecraft should have soared a year ago, but was held up by delays in flight software testing attributed to poor management and other issues. The revised schedule added extra travel time. So instead of arriving at the asteroid in 2026 as originally planned, the spacecraft won’t get there until 2029.That’s the same year that another NASA spacecraft — the one that just returned asteroid samples to the Utah desert — will arrive at a different space rock as it buzzes Earth.___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.。

B | 自小球时代席卷联盟而来，就再也没有产生过一支王朝球队了，最后一支王朝球队已经是离我们十二年之久的四年豪夺两冠的迈阿密热火了。为什么会出现这样的情况呢？究其原因，还是在于一个“快”字，就像小球时代的要求一样，打法在于快，更多的进攻回合，要求每个位置都能跑能投。

C | 也影响着现在的管理层都朝着这样的思路去建队，大家基本都有着一样的思路，就看谁在自由市场上做到“快准狠”，最终带来的结果就是建队快，拆队也快，要的是速成。所以从现如今NBA联盟各队组建阵容的思路，以及怎样的阵容会奏效，就很容易知道最终的冠军花落哪几家了。而经过休赛期的各种交易后，新赛季的夺冠热门也就显现出来了。首先排名第一，最大的夺冠热门非休赛期引援最成功的费城76人莫属了，用身背“垃圾合同”，联盟背景板的保罗乔治，换来单打之年，甚至还没有到达生涯巅峰期的MVP杰伦布朗。

D | 以及不花费任何筹码在自由市场上拿下还是联盟前十五的历史第一人勒布朗詹姆斯。再加上替补上补强了安芬尼和波普。这一系列的操作直接让76人坐拥联盟最强豪华阵容，让其登上夺冠排行榜榜首。这样的阵容在历史第一人勒布朗詹姆斯的带领下，若没有伤病困扰，十有八九拿下26-27赛季的NBA年度冠军。其次是排名第二的是，正在迅猛崛起的圣安东尼奥马刺队。虽然上个赛季在总决赛舞台上折戟，无功而返，但是经过上个赛的历练，让阵中的年轻天赋成长颇大。再加上阵容中还有着历史第一天赋文班亚马，哈伯，卡斯尔等年轻翘楚，以及经过一个休赛期的成长，这才把马刺排到打败他们的尼克斯前面。请记住新赛季的马刺不容小觑，虽然很难击败76人，但冲出西部应该不难。排名第三的是，俄克拉荷马雷霆。

E | 另一支阵容极其深厚的天赋异禀的年轻球队，阵容中有着连夺常规赛MVP的“历史第一碰瓷王”，还有切特和威廉姆斯这些年轻天赋，最主要的是雷霆有着联盟最深的阵容配置。上个赛季要不是受制于伤病，说实话马刺还真上不了总决赛舞台，也就没有尼克斯和布伦森夺冠的事了。新赛季的西部绝对是马刺和雷霆两强争夺的局面，雷霆能否复仇马刺，就要看切特能否克服心魔。最后给到排名第四的是，卫冕冠军纽约尼克斯。

F | 这也是一支阵容深厚的球队。可能很多球迷会问，为什么刚刚夺冠的球队，只能排到区区第四名。这是因为前面三支球队，无论天赋还是实力都要强过这支尼克斯，况且上个赛季对文班起到一定限制的米奇还走了，来了一个大漏洞德拉蒙德这个“糙汉子”。说实话要不是上个赛季运气好夺了冠，我都想把休赛期进行大换血的湖人了。所以说，给个排名也是对卫冕冠军的一种尊重，新赛季有76人在，尼克斯休想冲出东部。然后再看看，拥有现联盟第一人东契奇的湖人为什么不足以排进争冠榜排名前列，说白了还是受限于天赋二字，看看湖人休赛期的操作，只是补充了一些功能性的角色球员，这些人在季后赛能给到东契奇的帮助真的有限，而且二当家里夫斯打不了关键比赛是个事实。真的把一些没有天赋的球员拼凑在一起，要夺冠真的是痴人说梦。再一个是坐拥联盟第二人约基奇的丹佛掘金队，休赛期毫无作为，而且几个核心都受伤病侵袭，已经退出了争冠讨论，说实话新赛季掘金也就是常规赛打打漂亮比赛了。真的又是浪费约基奇天赋的一个赛季。

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Published on:20:09:23

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