甜蜜蜜

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

A |     Danielle 编译          据1 News报道，但尼丁南部的Woolworths在重新开放一个月后，又捕获了两只老鼠。         Advertise with us          该超市此前曾屡次发现老鼠——自去年10月首次发现问题以来，已经捕获了数十只老鼠。    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.。         于是，超市决定关闭约三周专门灭鼠，并定于2月28日重新开放。

B | 由于超市持续发现老鼠，所以开放时间多次推迟。         新西兰Woolworths门店主管Jason Stockill说，超市重新开放以来，已经捕获了“少量老鼠”，说明虫害管理计划和程序正在发挥作用。         他说，虫害管理是经营食品企业的“关键部分”，“我们非常认真地对待相关责任”，“将继续在全国范围内与Rentokil（灭虫害公司）和新西兰食品安全局密切合作。”          新西兰食品安全局副局长Vincent Arbuckle表示，超市重开之后又捕获了两只老鼠，但他对Woolworths一直以来对虫害管理的关注表示满意。         他说，一名食品合规官员将持续到访该超市，监督虫害防治行动。“值得注意的是，考虑到超市的规模和性质，老鼠可能会时不时地进出超市。”“只要问题得到及时处理，并将食品安全风险降至最低，那么超市不需要每次都关门。”          对这家超市的调查仍在继续。

C |          相关阅读：          消费者称在面包中发现老鼠脚！Foodstuffs已召回产品          Woolworths再曝食品卫生问题，顾客称很恶心：“太脏了！”          中国游客落地南岛第一天，被Countdown的活老鼠惊呆！          奥克兰这家超市也发现老鼠！视频曝光......          注：本文为编译/原创，欢迎转发分享；但严禁复制等未经授权的非法使用。违反上述声明者，本网将追究其相关法律责任。

D | 使用授权请联系[email protected]。

E |          chineseherald.co.nz All Rights Reserved 版权所有          (责编：丹妮)          来源 -          相关内容                气候危机还是逃学危机？他警告：你敢气候游行，我敢记你旷课           奥克兰一房屋被大火吞噬，一名女子和孩子及时逃生           政府节支路漫漫：38个公共服务部门又增加了数千名新员工           亚裔律师神操作：给客户立遗嘱，受益人写自己，客户全家“净身出户”……           员工润去了黄金海岸，奥克兰市议会允许其远程工作           住豪宅、开法拉利，奥克兰华人毒枭承认是贩毒集团头目           奥克兰北岸绑架案：一男一女在酒吧被捕，绑架动机是......           彩虹活动被取消、人行道被破坏，新西兰仇恨犯罪又回来了？。

Current article:http://ysiy7.zhanggengsenchaiweikeng.cfd/1am1/6j3eoe.html

Published on:12:34:51