波多野结衣办公室双飞_制服 丝袜 综合 日韩 欧美_网站永久看片免费_欧美一级片在线免费观看_免费视频91蜜桃_精产国品一区二区三区_97超碰免费在线观看_欧美做受喷浆在线观看_国产熟妇搡bbbb搡bbbb_麻豆精品国产传媒

US EUROPE AFRICA ASIA 中文
World / China-US

Gravitational waves detected a century after Einstein theory

By CHEN WEIHUA in Washington (China Daily USA) Updated: 2016-02-12 01:57

Scientists have for the first time observed ripples in the fabric of spacetime called gravitational waves, arriving at the earth from a cataclysmic event in the distant universe. It confirms a major prediction of Albert Einstein’s 1915 general theory of relativity and opens an unprecedented new window to the cosmos, according to a group of scientists at a press conference in Washington on Thursday.

“This is truly scientific moonshot. We did it. We landed on the moon,” exclaimed David Reitz, executive director of the LIGO Laboratory at Caltech, at the conference in the National Press Club.

According to the National Science Foundation (NSF) experts, gravitational waves carry information about their dramatic origins and about the nature of gravity that cannot be obtained from elsewhere. Physicists have concluded that the detected gravitational waves were produced during the final fraction of a second of the merger of two black holes to produce a single, more massive spinning black hole. This collision of two black holes had been predicted but never observed.

The gravitational waves were detected on Sept 14, 2015 at 5:51 am EDT by both of the twin Laser Interferometer Gravitational-wave Observatory (LIGO) detectors, located in Livingston, Louisiana, and Hanford, Washington.

Based on the observed signals, LIGO scientists estimate that the black holes for this event were about 29 and 36 times the mass of the sun, and the event took place 1.3 billion years ago. About three times the mass of the sun was converted into gravitational waves in a fraction of a second -- with a peak power output about 50 times that of the whole visible universe. By looking at the time of arrival of the signals -- the detector in Livingston recorded the event 7 milliseconds before the detector in Hanford -- scientists can say that the source was located in the Southern Hemisphere, according to a press release from NSF, which funded the research.

According to general relativity, a pair of black holes orbiting around each other lose energy through the emission of gravitational waves, causing them to gradually approach each other over billions of years, and then much more quickly in the final minutes. During the final fraction of a second, the two black holes collide at nearly half the speed of light and form a single more massive black hole, converting a portion of the combined black holes' mass to energy, according to Einstein's formula E=mc2. This energy is emitted as a final strong burst of gravitational waves. These are the gravitational waves that LIGO observed.

The existence of gravitational waves was first demonstrated in the 1970s and 1980s by Joseph Taylor, Jr., and colleagues. In 1974, Taylor and Russell Hulse discovered a binary system composed of a pulsar in orbit around a neutron star. Taylor and Joel M. Weisberg in 1982 found that the orbit of the pulsar was slowly shrinking over time because of the release of energy in the form of gravitational waves. For discovering the pulsar and showing that it would make possible this particular gravitational wave measurement, Hulse and Taylor were awarded the 1993 Nobel Prize in Physics.

The new LIGO discovery is the first observation of gravitational waves themselves, made by measuring the tiny disturbances the waves make to space and time as they pass through the earth.

“Our observation of gravitational waves accomplishes an ambitious goal set out over five decades ago to directly detect this elusive phenomenon and better understand the universe, and, fittingly, fulfills Einstein's legacy on the 100th anniversary of his general theory of relativity,” Reitze said.

LIGO research is carried out by the LIGO Scientific Collaboration (LSC), a group of more than 1,000 scientists from universities around the United States and in 14 other countries. More than 90 universities and research institutes in the LSC develop detector technology and analyze data; approximately 250 students are strong contributing members of the collaboration.

“This detection is the beginning of a new era: The field of gravitational wave astronomy is now a reality,” says Gabriela Gonzalez, LSC spokesperson and professor of physics and astronomy at Louisiana State University.

LIGO was originally proposed as a means of detecting gravitational waves in the 1980s by Rainer Weiss from MIT; Kip Thorne and Ronald Drever, both from Caltech.

“The description of this observation is beautifully described in the Einstein theory of general relativity formulated 100 years ago and comprises the first test of the theory in strong gravitation. It would have been wonderful to watch Einstein's face had we been able to tell him,” Weiss said.

“With this discovery, we humans are embarking on a marvelous new quest: the quest to explore the warped side of the universe -- objects and phenomena that are made from warped spacetime. Colliding black holes and gravitational waves are our first beautiful examples,” said Thorne.

chenweihua@chinadailyusa.com

Trudeau visits Sina Weibo
May gets little gasp as EU extends deadline for sufficient progress in Brexit talks
Ethiopian FM urges strengthened Ethiopia-China ties
Yemen's ex-president Saleh, relatives killed by Houthis
Most Popular
Hot Topics

...
波多野结衣办公室双飞_制服 丝袜 综合 日韩 欧美_网站永久看片免费_欧美一级片在线免费观看_免费视频91蜜桃_精产国品一区二区三区_97超碰免费在线观看_欧美做受喷浆在线观看_国产熟妇搡bbbb搡bbbb_麻豆精品国产传媒
成人无码av片在线观看| 精品国产乱码久久| 最近日韩中文字幕| 国产精品白丝jk黑袜喷水| 久久久久久九九九九九| 日韩欧美中文一区| 奇米精品一区二区三区在线观看| 视频免费在线观看| 欧美一区二区三区影视| 天天色综合天天| 波多野结衣影院| 欧美第一区第二区| 老司机午夜精品| 亚洲精品91在线| 欧美高清在线精品一区| 成人影视亚洲图片在线| 色婷婷av一区| 一区二区三区**美女毛片| 苍井空张开腿实干12次| 欧美精品日韩一本| 琪琪久久久久日韩精品| 中文字幕第20页| 欧美激情资源网| 99久久夜色精品国产网站| 欧美亚洲一区三区| 午夜av电影一区| 91成人在线免费视频| 国产视频在线观看一区二区三区 | 日韩毛片在线免费观看| av一二三不卡影片| 欧美日韩黄视频| 视频在线观看一区| 人与嘼交av免费| 日韩一区欧美小说| 任你躁av一区二区三区| 日韩精品一区二区三区四区| 国产在线不卡一区| 色综合天天综合狠狠| 亚洲国产成人精品视频| 久久精品—区二区三区舞蹈| 国产精品无遮挡| 永久看看免费大片| 日韩色在线观看| 日韩丝袜情趣美女图片| 麻豆国产精品777777在线| 国产精品久久国产精麻豆96堂| 自拍偷拍欧美精品| 白嫩情侣偷拍呻吟刺激| 久久久国产精华| 99久久精品久久久久久清纯| 欧美一区二区视频在线观看2020| 国产乱人伦精品一区二区在线观看| 色综合av在线| 日本成人中文字幕在线视频| 成人一级黄色大片| 亚洲高清在线精品| 污污视频网站在线免费观看| 亚洲综合区在线| 粉嫩精品久久99综合一区| 亚洲激情一二三区| 男人的天堂官网| 亚洲制服丝袜在线| 国产aaaaaaaaa| 亚洲成av人在线观看| 国产白丝一区二区三区| 亚洲国产精品一区二区www在线 | 亚洲图片另类小说| 亚洲精品五月天| 久久久久久成人网| 亚洲福利国产精品| 91传媒免费观看| 青青草成人在线观看| 日本伦理一区二区| 国内成人精品2018免费看| 欧美日韩高清一区| 岛国av在线一区| 精品国产乱码久久久久久影片| 91农村精品一区二区在线| 久久久99精品久久| 男人的天堂影院| 亚洲欧美日韩国产成人精品影院| 丁香花五月婷婷| 日韩精品国产精品| 在线亚洲高清视频| 国产成人免费xxxxxxxx| 日韩视频一区二区三区在线播放| 99久久综合国产精品| 国产日韩欧美一区二区三区乱码| 800av在线播放| 一区二区三区欧美| 免费国产羞羞网站美图| 精品一区二区精品| 日韩午夜电影av| 日本人添下边视频免费| 亚洲欧美色图小说| 四虎884aa成人精品| 激情图片小说一区| 精品欧美一区二区久久| 国产精品久久久久久久无码| 亚洲男女毛片无遮挡| 污软件在线观看| 国产一区二区三区不卡在线观看| 日韩欧美二区三区| 一级特黄a大片免费| 亚洲午夜精品在线| 在线视频国产一区| 99视频国产精品| 亚洲欧洲99久久| 国产一区二区三区在线视频观看| 国产一区二区主播在线| 久久综合色婷婷| 黄色aaa视频| 欧美日韩精品三区| 国产伦精品一区二区三区妓女下载| 国产精品国产三级国产普通话三级| 亚洲图片第一页| 国产美女娇喘av呻吟久久| 久久伊人蜜桃av一区二区| 日韩人妻一区二区三区| 奇米色一区二区三区四区| 91精品国产aⅴ一区二区| 一区二区免费在线观看视频| 亚洲电影中文字幕在线观看| 欧美欧美午夜aⅴ在线观看| 女女调教被c哭捆绑喷水百合| 一区二区三区鲁丝不卡| 欧美主播一区二区三区| 曰本三级日本三级日本三级| 亚洲自拍欧美精品| 欧美精品乱人伦久久久久久| 五十路六十路七十路熟婆| 日本伊人色综合网| 欧美sm美女调教| 夜夜春很很躁夜夜躁| 国产毛片精品国产一区二区三区| 国产三级一区二区| 91九色丨porny丨极品女神| 99视频精品在线| 亚洲国产中文字幕在线视频综合| 欧美福利视频导航| 亚洲欧美日本一区| 久久91精品国产91久久小草| 国产欧美日韩亚州综合| 成人免费毛片东京热| 在线观看免费看片| 日韩成人一区二区| 精品久久国产97色综合| 欧美日韩国产黄色| 成人激情视频网站| 亚洲国产中文字幕| 日韩视频在线观看一区二区| 日韩欧美黄色网址| 不卡视频一二三| 亚洲国产欧美一区二区三区丁香婷| 51久久夜色精品国产麻豆| 久久久久久国产精品无码| 国产91清纯白嫩初高中在线观看| 亚洲女与黑人做爰| 欧美一区二区视频免费观看| 亚洲AV无码成人精品区明星换面| 福利91精品一区二区三区| 一区二区三区四区视频精品免费| 欧美一级二级三级乱码| 日本在线观看网址| 精品国产午夜福利在线观看| 日av在线不卡| 国产精品美女一区二区| 欧美女孩性生活视频| 大胸美女被爆操| 人妻巨大乳一二三区| 久久成人18免费观看| 最新国产成人在线观看| 日韩欧美色综合| 538任你躁在线精品视频网站| 天天躁日日躁狠狠躁免费麻豆| 久久se精品一区二区| 亚洲女性喷水在线观看一区| 日韩欧美亚洲国产另类| 久久爱一区二区| 日本一级大毛片a一| 国产精品资源在线观看| 一级做a爱片久久| 久久久久久电影| 欧美日韩一本到| 中文字幕精品亚洲| 国内精品免费视频| 国产成人免费视频网站高清观看视频| 亚洲福利一区二区| 国产精品视频看| 欧美不卡一区二区| 91国产免费看| 9.1片黄在线观看| www.17c.com喷水少妇| 国产一区二区三区蝌蚪| 日日夜夜免费精品| 1区2区3区欧美| 久久久青草青青国产亚洲免观| 欧美三电影在线| 暗呦丨小u女国产精品| 免费在线观看你懂的|