作者：辛宗龙陵 来源：原创 发布日期：08-26
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.。
阿里云优惠券 先领券再下单 每年的618购物节都是消费者囤货、升级家电数码的黄金时机。但长达一个月的促销周期中，哪天才是真正的“年度最低价”？2025年的答案已经揭晓：6月17日晚8点至6月18日凌晨，这28小时被京东官方定义为“年度价格冰点”，淘宝则称为“终极狂欢爆发期”。本文将用最通俗的语言，解析为何此时最划算，并教你如何轻松省钱！ 首先，划重点！今年天猫/淘宝和京东的618红包口令全都是「好运红包7788」要记住！领的红包大小和你搜索的什么口令有关的！这个双平台通用口令包领到大的！记得每天去领！ 搜口令「好运红包7788」，发放力度更大，还有iphone16免单！ 京东APP搜：好运红包7788 淘宝APP搜：好运红包7788 这个双平台通用口令每晚8点还能额外领取一次哦！ 秘诀：先在app搜一下口令，以后每天点历史搜索记录就可以了！
B | 2. 会员特权集中爆发 - 京东PLUS会员：领“满6000返600京豆”（相当于再打9折）。
C | - 淘宝88VIP：享95折+“满5000减400”券，直播间限量发“满10000减1000”隐藏券。 3. 爆款库存翻3倍，半价抢大牌 - 硬通货备货量增加300%： iPhone 16：原价7999元→5999元（直降2000元） 戴森吹风机：开门红2599元→2299元（再省300元） 4. 红包雨+限时秒杀双重加码 - 搜口令“好运红包7788”，每日抽最高25618元红包（含iPhone 16免单）。 - 6月16日起每晚8点红包奖池翻倍，中签率提升80%。 二、黄金28小时分时段作战指南 ✅ 倒计时备战（6月17日19:50） - 加购目标商品，开通免密支付 - 领补贴口令： 京东搜“家电省2000”/“数码省2000” 淘宝88VIP兑换“满5000减400”券 闪电抢购（20:00-20:10） - 优先抢iPhone/茅台/戴森（10秒售罄品） - 蹲李佳琦/罗永浩直播间领专属券（如美妆“满999减200”）
申请创业报道，分享创业好点子。点击此处，共同探讨创业新机遇！。
Current article:http://www.chenzhuaigecoupuhongyuntuizei.sbs/lrycdbv/3sp.html
Published on:04:12:00