<tt id="6hsgl"><pre id="6hsgl"><pre id="6hsgl"></pre></pre></tt>
          <nav id="6hsgl"><th id="6hsgl"></th></nav>
          国产免费网站看v片元遮挡,一亚洲一区二区中文字幕,波多野结衣一区二区免费视频,天天色综网,久久综合给合久久狠狠狠,男人的天堂av一二三区,午夜福利看片在线观看,亚洲中文字幕在线无码一区二区

          1st planet orbiting 2 stars discovered

          Updated: 2011-09-16 14:13

          (Xinhua)

            Comments() Print Mail Large Medium  Small 分享按鈕 0

          1st planet orbiting 2 stars discovered

          NASA handout image shows an artist's concept of the circumbinary planet Kepler-16b - the first planet known to definitively orbit two stars. [Photo/Agencies]

          WASHINGTON - A team of researchers has discovered a planet that orbits around a pair of stars, the US space agency NASA announced Thursday.

          This is the first instance of astronomers finding direct evidence of a so-called circumbinary planet. A few other planets have been suspected of orbiting around both members of a dual-star system, but the transits of the circumbinary planet have never been detected previously.

          The team, led by Laurance Doyle of the SETI Institute in California, used photometric data from the NASA Kepler space telescope, which monitors the brightness of 155,000 stars.

          They found the binary star system by detecting a system where the stars eclipsed each other from the perspective of the Kepler spacecraft. These stars have two eclipses: A primary eclipse when the larger star is partially blocked by the smaller star and a secondary eclipse where the smaller star is fully blocked by the larger star.

          But the researchers also noticed other times when the brightness of the two stars dropped, even when they were not in an eclipse position. This pattern suggested that there was likely a third object involved. The fact that these so-called tertiary and quaternary eclipses recurred after varying intervals of time, and were of different depths, indicated that the stars were in different positions in their orbit at each instance. This result showed that the tertiary and quaternary eclipses were being caused by something circling both stars, and not an object circling one or the other star.

          Measurements of the variations in the timing of all four types of eclipses, resulting from the mutual gravitational interactions of the two stars and the third body, demonstrated that the third object was, indeed, a planet. Their work indicates that the planet is less massive than Jupiter, possibly comparable in mass to Saturn, and that the larger of the two binary stars is smaller than our Sun.

          Their findings will be published Friday in Science.

          "This discovery confirms a new class of planetary systems that could harbor life," Kepler principal investigator William Borucki said in a statement. "Given that most stars in our galaxy are part of a binary system, this means the opportunities for life are much broader than if planets form only around single stars. This milestone discovery confirms a theory that scientists have had for decades but could not prove until now."

             Previous Page 1 2 Next Page  

          主站蜘蛛池模板: 被灌满精子的波多野结衣| 少女たちよ在线观看| 国产亚洲无线码一区二区| 国语精品一区二区三区| 日韩精品久久久肉伦网站| 嫩草院一区二区乱码| 国产一区二区三区啪| 玩弄放荡人妻少妇系列| 亚国产亚洲亚洲精品视频| 在线午夜精品自拍小视频| 国产无遮挡又黄又爽不要vip软件| 精品无码国产一区二区三区av| 亚洲欧美日韩国产四季一区二区三区| 成人国产精品视频频| 偷拍精品一区二区三区| 一本大道东京热无码| 国产精品中文字幕二区| 久久精品伊人无码二区| 国产午夜三级一区二区三| 亚洲一区二区三区激情视频| 老熟妇老熟女老女人天堂| 97久久精品人人做人人爽| 午夜精品区| 日日噜噜夜夜狠狠视频| 少妇被粗大的猛烈进出69影院一 | 久久婷婷综合色一区二区| 最近中文字幕免费手机版| 国产精品麻豆成人AV电影艾秋| 一本久道久久综合婷婷五月| 翘臀少妇被扒开屁股日出水爆乳| 成人无码AV一区二区| 在线a亚洲老鸭窝天堂| 亚洲欧美国产精品久久| 无套内谢少妇一二三四| 亚洲第一区二区国产精品| 99精品国产一区在线看| 国产偷国产偷亚洲清高动态图| 国内久久人妻风流av免费| 亚洲永久一区二区三区在线| 国产短视频一区二区三区| 久久精品国产久精国产果冻传媒|