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

US EUROPE AFRICA ASIA 中文
World / Kaleidoscope

New planet discovered in habitable zone

(Agencies) Updated: 2012-11-08 08:47

LONDON - An Anglo-German team of astronomers has discovered a new planet orbiting a nearby sun at just the right distance for an Earth-like climate that could support life.

The team actually found three new planets orbiting the star 44 light years away, but only one of them is in the so-called Goldilocks Zone, the band around a sun where temperatures are neither too hot nor too cold for liquid water to exist.

"The star HD 40307 is a perfectly quiet old dwarf star, so there is no reason why such a planet could not sustain an Earth-like climate," said Guillem Angla-Escude from Germany's University of Goettingen, who led the research with Mikko Tuomi at the University of Hertfordshire in Britain.

The planet has a mass at least seven times that of Earth but it orbits at about the same distance from its sun, meaning it receives a similar amount of solar energy as Earth gets.

More than 800 planets have been discovered outside our solar system since the first was detected in the early 1990s, but only a handful of those have been in the habitable zone.

Even more rare are planets in the zone that rotate, as this one does, to create a day-time and night-time, which increases the chance of an Earth-like environment. Those that don't spin are said to be tidally locked, with one half in constant darkness.

"This is the closest one to Earth in a habitable zone that is not tidally locked," University of Hertfordshire astronomer Hugh Jones told Reuters.

"Just as Goldilocks liked her porridge to be neither too hot nor too cold but just right, this planet, or indeed any moons that it has, lie in an orbit comparable to Earth, increasing the probability of it being habitable."

The planet, named HD 40307g, is part of a system that was previously thought to have just three planets, all in orbits too close to the star to support liquid water.

The astronomers made the discovery, unveiled in a research paper in the journal Astronomy & Astrophysics, by examining data from the HARPS spectrograph, attached to a European Southern Observatory telescope at La Silla in Chile's Atacama desert.

The HARPS device is able to pick up tiny changes in the color of the light coming from a host star as it wobbles under the gravitational influence of orbiting planets.

The team used a novel technique to filter out signals caused by the host star itself. "This significantly increased our sensitivity and enabled us to reveal three new planets around the star," said Mikko Tuomi.

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

...
主站蜘蛛池模板: 一级片网址 | 精品欧美一区二区三区四区 | 一个人看的www片免费视频中文 | 澳门毛片免费观看 | 欧美xxxxx色视频在线观看 | 国产区一区二区三 | 精品亚洲大全 | 中文字幕一区二区三区在线观看 | 国产精品自拍一区 | 91精品国产9l久久久久 | 亚洲自拍小视频 | 日韩a毛片免费全部播放完整 | 欧美一线视频 | 久久精品国产亚洲aa | 99视频在线| 免看一级一片一在线看 | 国产免费a级片 | 一级成人a毛片免费播放 | 国产亚洲精品hd网站 | 男女午夜免费视频 | 男女同床爽爽视频免费 | 国产精品中文 | 在线看毛片网站 | 99久久综合国产精品免费 | 91年精品国产福利线观看久久 | 亚洲综合无码一区二区 | 男吃女下面刺激视频免费 | 欧美丝袜xxxxx在线播放 | 国产精品揄拍一区二区 | 韩国一大片a毛片 | 色综合精品 | 国产a免费观看 | 寡妇一级a毛片免费播放 | 91久久精品一区二区三区 | 成人免费高清视频 | 韩国福利影视一区二区三区 | a级片免费 | 欧美成人性色生活片免费在线观看 | 国产成人aaa在线视频免费观看 | 欧美一级xxxx俄罗斯一级 | 亚洲国产精品久久人人爱 |