www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

USEUROPEAFRICAASIA 中文雙語Fran?ais
World
Home / World / Americas

NASA gives up on lost comet probe

Agencies | Updated: 2013-09-21 09:51

CAPE CANAVERAL, Fla. - NASA is calling off attempts to find its Deep Impact comet probe after a suspected software glitch shut down radio communications in August, officials said on Friday.

The spacecraft was launched in January 2005 for a close-up study of Comet Tempel-1.

It was not just a passive experiment. The probe released an 820-pound (372-kg) metal slug that crashed into the comet's nucleus, triggering a shower of particles for analysis by the mother spacecraft and remote observatories.

Deep Impact continued its comet quest with a flyby of Hartley 2 in November 2010 and long-distance studies of other bodies, including the approaching Comet ISON. The spacecraft was also used to look for planets beyond the solar system.

NASA last heard from Deep Impact on August 8. Engineers suspect a software problem caused the spacecraft to lose its orientation system, cutting off radio contact with Earth in the process.

After a month of fruitless attempts to find the probe, NASA on Friday announced it was formally ending the mission.

"Despite this unexpected final curtain call, Deep Impact already achieved much more than ever was envisioned," Lindley Johnson, who oversees the program at NASA Headquarters in Washington, said in a statement.

University of Maryland astronomer Michael A'Hearn, who led the Deep Impact science team, said in a separate statement: "I'm saddened by its functional loss. But, I am very proud of the many contributions to our evolving understanding of comets that it has made possible."

"These small, icy remnants of the formation of our solar system are much more varied, both one from another and even from one part to another of a single comet, than we had ever anticipated," A'Hearn said.

NASA had hoped Deep Impact would play a key role in observations of the approaching Comet ISON, a suspected first-time visitor to the inner solar system that was discovered in September 2012 by two Russian astronomers.

The comet is heading toward a close encounter with the sun in November, a brush that it may not survive.

Later this month, NASA's Mars Curiosity rover and Mars Reconnaissance Orbiter will attempt to catch a glimpse of the comet as it flies by Mars.

 

Most Viewed in 24 Hours
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: 日产国产精品亚洲系列 | 波多野结衣福利视频 | 国内自拍亚洲 | 日本亚洲欧美高清专区vr专区 | 精品一区二区三区18 | 99re热视频| 视频在线二区 | 国产毛片久久久久久国产毛片 | 国产精品久久久久国产精品 | 91av国产在线 | 老司机成人免费精品视频 | 国产成人夜间影院在线观看 | 在线观看二区三区午夜 | 久草视屏 | 亚洲国产第一区二区三区 | 国产高清在线精品一区二区 | 毛片a级三毛片免费播放 | 久久欧美久久欧美精品 | 精品国产一区二区三区免费看 | 国产三区视频在线观看 | 久久中出| 国产xvideos国产在线 | 欧美成人观看免费版 | 韩国在线精品福利视频在线观看 | 性刺激欧美三级在线现看中文 | 成年人黄色免费网站 | 国产不卡在线视频 | 一级做a爰片久久毛片16 | 亚洲欧美日韩在线精品一区二区 | 久久999视频 | 国内精品线在线观看 | 在线一区国产 | 欧美三级一区二区 | 日韩精品久久久免费观看夜色 | 国内精品久久久久影院网站 | 68 日本xxxxxxxxx 视频 | 久久一级片 | 国产成人精品免费视频大全五级 | 国产亚洲欧美成人久久片 | 一级毛片aaa片免费观看 | 精品欧美一区二区在线观看欧美熟 |