在线国产一区二区_成人黄色片在线观看_国产成人免费_日韩精品免费在线视频_亚洲精品美女久久_欧美一级免费在线观看

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: 久久久久久免费 | 午夜视频一区 | 国产美女精品一区二区 | 国产高清久久久 | 国产一区二区三区在线免费 | 九色91视频 | 成人免费视频www在线观看我 | 精品久久久一区 | 午夜精品一区二区三区免费视频 | 一区二区三区回区在观看免费视频 | 成人中文字幕在线 | 天天草综合 | 成人亚洲视频 | 羞羞的网站在线观看 | 中文一区二区 | 中文字幕一区二区三区乱码在线 | 欧美精品在线一区二区三区 | 午夜影院免费视频 | 日韩av一区二区在线观看 | 国产中文字幕免费在线观看 | 国产精品91网站 | 成人精品免费视频 | 欧美激情在线播放 | 久久久久久久国产精品 | 四虎国产精品成人免费影视 | 国产一区二区精彩视频 | 国产一级电影网 | 久久久久久久久99精品 | 欧美视频精品在线观看 | 久久99蜜桃综合影院免费观看 | 蜜桃久久av | 中文字幕在线三区 | 亚洲欧洲一区二区三区 | 国产精品一区二区欧美 | 成年人网站免费在线观看 | 亚洲一区在线播放 | 人人爽人人爱 | 国产一区免费在线观看 | 国产在线一区二 | 精品久久久久久久久久久久久久 | 精品日韩av |