久久亚洲国产成人影院-久久亚洲国产的中文-久久亚洲国产高清-久久亚洲国产精品-亚洲图片偷拍自拍-亚洲图色视频

Global EditionASIA 中文雙語Fran?ais
World
Home / World / Americas

NASA's InSight lands on Mars to peer into planet's deep interior

Updated: 2018-11-27 04:53
Share
Share - WeChat
NASA InSight team members rejoice after getting confirmation of a successful landing on Mars. [Photo/NASA]

DAREDEVIL LANDING

InSight was the eighth spacecraft to have landed successfully on Mars, all of them operated by NASA.

The three-legged lander streaked into the thin Martian atmosphere at 12,300 miles (19,795 km) per hour and plunged 77 miles to the surface within seven minutes, slowed to a gentle touchdown by atmospheric friction, a giant parachute and retro rockets.

The stationary probe was programmed to pause for 16 minutes for the dust to settle, literally, around its landing site, before two disc-shaped solar panels were to be unfurled like wings to provide power to the spacecraft.

But scientists did not expect to verify successful deployment of the solar arrays for at least several hours.

The 880-pound (360 kg) InSight - its name is short for Interior Exploration Using Seismic Investigations, Geodesy and Heat Transport - marks the 21st U.S.-launched Mars mission, dating back to the Mariner fly-bys of the 1960s.

Nearly two dozen other Mars missions have been sent from other nations.

InSight's new home in the middle of Elysium Planitia, a wide, relatively smooth expanse close to the planet's equator, is roughly 373 miles (600 km) from the 2012 landing spot of the car-sized Mars rover Curiosity, the last spacecraft sent to the Red Planet by NASA.

PEERING BENEATH SURFACE

InSight's primary instrument is a French-built seismometer, designed to record the slightest vibrations from "marsquakes" and meteor impacts around the planet. The device, to be placed on the surface by the lander's robot arm, is so sensitive it can measure a seismic wave just one half the radius of a hydrogen atom.

Scientists expect to see a dozen to 100 marsquakes during the mission, producing data to help them deduce the depth, density and composition of the planet's core, the rocky mantle surrounding it, and the outermost layer, the crust.

The NASA Viking probes of the mid-1970s were equipped with seismometers, too, but they were bolted to the top of the landers, a design that proved largely ineffective.

Apollo missions to the moon brought seismometers to the lunar surface as well. But InSight is expected to yield the first meaningful data on planetary seismic tremors beyond Earth.

A second instrument, furnished by Germany's space agency, consists of a drill to burrow as much as 16 feet (5 meters) underground, pulling behind it a rope-like thermal probe to measure heat flowing from inside the planet.

Meanwhile, a radio transmitter will send back signals tracking Mars' subtle rotational wobble to reveal the size of the planet's core and possibly whether it remains molten.

NASA officials say it will take two to three months for the main instruments to be deployed and put into operation.

The landing data and initial photograph were relayed to Earth from two briefcase-sized satellites that were launched along with InSight and were flying past Mars as it reached its destination. The twin "Cubesats" tagging along for the flight to Mars represented the first deep-space use of a miniature satellite technology that space engineers see as a promising low-cost alternative to some larger, more complex vehicles.

Reuters

 

|<< Previous 1 2   
Most Viewed in 24 Hours
Top
BACK TO THE TOP
English
Copyright 1995 - . All rights reserved. The content (including but not limited to text, photo, multimedia information, etc) published in this site belongs to China Daily Information Co (CDIC). Without written authorization from CDIC, such content shall not be republished or used in any form. Note: Browsers with 1024*768 or higher resolution are suggested for this site.
License for publishing multimedia online 0108263

Registration Number: 130349
FOLLOW US
主站蜘蛛池模板: 男人的天堂黄色 | 国产精品成aⅴ人片在线观看 | 欧美视频在线一区二区三区 | 久久亚洲国产欧洲精品一 | 青青草原色| 国产成人在线免费视频 | 国产成人午夜性a一级毛片 国产成人午夜性视频影院 国产成人香蕉久久久久 | 国产在线更新 | 国产成人综合日韩精品婷婷九月 | 日韩不卡在线 | 男人的天堂视频在线观看 | 一级欧美一级日韩毛片99 | 青青热久久综合网伊人 | avtom影院入口永久在线 | 成人亚洲精品一区二区 | 日韩国产欧美在线观看 | 欧美在线二区 | 久久香蕉国产线看观看亚洲片 | 日韩精品999| 毛片网站视频 | 在线播放免费一级毛片欧美 | 毛片在线观看视频 | 国产精品毛片久久久久久久 | 亚洲欧美韩日 | 亚洲成人福利网站 | 狠狠色丁香婷婷综合小时婷婷 | 亚洲第一中文 | 亚洲三级在线播放 | 日韩一级免费毛片 | 女人张开腿让男人捅爽 | 国产91久久精品 | 9cao视频精品 | 欧美一级色 | 在线观看亚洲人成网站 | 91视频站 | 最新欧美一级视频 | 国产日韩欧美精品一区 | 国产成人亚洲精品老王 | 国产成人不卡亚洲精品91 | 老司机亚洲精品 | 欧美成国产精品 |