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

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A | 8月26日上午，中共中央政治局常委、全国人大常委会委员长赵乐际同列席十四届全国人大常委会第二十四次会议的全国人大代表座谈交流。 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.。新华社记者庞兴雷摄　　新华社北京8月26日电(记者齐琪)中共中央政治局常委、全国人大常委会委员长赵乐际26日上午同列席十四届全国人大常委会第二十四次会议的全国人大代表座谈交流。他强调，要认真学习贯彻习近平总书记关于“三农”工作的重要论述和党中央决策部署，密切联系群众，发挥专业特长，履行代表职责，为持续巩固拓展脱贫攻坚成果、扎实推进乡村全面振兴作出新贡献。　　座谈会上，代表们围绕本次常委会会议审议关于持续巩固拓展脱贫攻坚成果、扎实推进乡村全面振兴工作情况的报告，结合履职实际作了发言。赵乐际认真倾听，同代表深入交流。他说，党的十八大以来，以习近平同志为核心的党中央团结带领人民打赢脱贫攻坚战，消除绝对贫困，如期全面建成小康社会，创造了举世瞩目的减贫奇迹。从2021年到2025年设立5年过渡期，推动巩固拓展脱贫攻坚成果同乡村振兴有效衔接，使脱贫基础更加稳固、成效更可持续。各级人大代表依法履职、担当尽责，贡献了智慧和力量。　　赵乐际指出，人大代表要围绕落实“十五五”规划纲要确定的涉农重要举措，结合常委会立法、监督工作安排，深入调研思考、积极建言献策，针对制约农业农村发展的突出短板、影响农民群众切身利益的突出问题，注重从法律和制度层面提出意见建议。　　赵乐际指出，人大代表要立足本职岗位担当实干、建功立业。

B | 来自农业农村一线的代表要认真做好本职工作，带动农民群众因地制宜发展生产、增收致富。

C | 其他行业和领域的代表也要关心支持农业农村发展，各尽其能、各展其长，积极参与常态化精准帮扶，共同推动农民富、农业强、农村美。　　赵乐际强调，人大代表要自觉当好党和国家联系人民群众的桥梁，及时了解和反映农民群众急难愁盼问题，更好接地气、察民情、聚民智、惠民生。要模范遵守宪法法律，积极参与农村法治宣传教育，引导农民群众办事依法、遇事找法、解决问题用法、化解矛盾靠法。要带头践行社会主义核心价值观，以身作则，崇德向善，弘扬良好乡风民风。　　中共中央政治局委员、全国人大常委会副委员长李鸿忠主持座谈会。【编辑:黄嘉雯】。

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