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

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一 | 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.。 AI摘要福建省消委会发布家装消费提示，警惕低价套餐中配置降级、故意漏项及定金退款难等陷阱。建议消费者核对明细、签署闭口合同、控制预付比例并将承诺写入合同，以规避风险。每年9月至10月是装修施工的黄金期，也是各大装修公司的签约旺季。“599元/㎡全包”“69800元拎包入住”“交1万元抵3万元”……这样的超低价促销套餐铺天盖地。然而，看似诱人的高性价比套餐背后，有可能隐藏着消费陷阱。

二 | 对此，25日，省消委会发布消费提示，提醒消费者警惕低价家装套餐常见的三种陷阱。

三 | 低价引流，配置降级。所谓超低价促销套餐，往往仅包含最基础的施工项目和配置最低的装修材料。套餐内提供的瓷砖、地板、卫浴等多为淘汰款式或低配产品，一旦消费者想要升级材料，就必须支付高额溢价。隐瞒刚需，故意漏项。

四 | 商家在前期报价时，会故意剔除旧房拆除、墙面铲除、水电改造、防水加高、垃圾清运等必不可少的工程项目。施工开始后，再以“刚需增项”为由强行加价，此时消费者已骑虎难下，只能被迫买单。定金锁客，退款艰难。商家常以“活动名额有限”“今天不交定金优惠就失效”等噱头诱导消费者，令消费者在尚未看清具体设计方案和明细报价的情况下，就急于缴纳大额款项。后续一旦发现问题想要退款，商家便以定金不退为由拒绝退款。针对上述家装套餐陷阱，省消委会提示，消费者在选择装修服务时要紧盯这“四要素”。

五 | 拒绝模糊报价，逐项核对明细。不要轻信所谓“一口价”或总价包干的说法。签订合同前，要求商家提供详细的施工图纸和工程量清单，逐条核对包含与不含的项目，并明确标注材料的品牌、系列、规格、型号及环保等级，拒绝接受“同等品质品牌”等模糊表述。签署闭口合同（即固定总价合同），锁定增项上限。签订闭口合同时，明确约定“按套内面积计价”“杜绝故意漏项，套餐以外在不改变设计方案的前提下，预算等于决算”“非业主书面签字确认，施工方不得擅自增项或调整费用”，提前锁定增项费用上限。控制预付比例，守住资金安全。根据《民法典》规定，定金数额不得超过主合同标的额的20%。在未确定最终施工方案前，切勿支付大额预付款。

六 | 若消费者缴纳的款项被商家定性为“预付款”而非“定金”，20%的上限规定并不直接适用。坚持落纸为据，承诺写入合同。销售人员或设计师在签约前承诺的免费升级材料、赠送家电、免除垃圾清运费、隐蔽工程延保等优惠条款，必须全部补充写进正式合同条款。除主施工合同约定的价格、工期、零增项等以外，合同组成部分还必须包含环保保障、材料保真、售后保修期限等内容。切勿相信任何口头保证，避免后续出现纠纷无据可查。（记者黄筱菁）。

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Published on:04:48:04