黄豆,[太空] NASA找地球“大表哥”漫漫征途(双语),一曲红尘

当地时间7月23日(北京时间7月24日清晨零点),美国航天局宣告:经过开普勒太空望远镜,天文学家承认在宜居带发现了第一课与地球巨细类似的太阳系外行星,这是迄今为止最接近“另一个地球”的系外行星,其类似指数为0.98。

这个音讯传开后,许多网友惊呼:咱们找到了地球的“大表哥”!而美国宇航局的一些科学家也给这颗行星起了一个称谓——地球2.0。

NASA announced on Thursday that a planet near the size of the Earth has been discovered via the planet-hunting Kepler space telescope. It's been hailed as "the Earth's closest twin".

It's been estimated that the planet has 98 percent of similarity to the Earth.

Many netizens say that the Earth's "closest cousin" has been found, while many scientists also say they've found Earth 2.0.

Confirmation of the discovery also brings the total number of planets found by to 1,030.

开普勒452b小档案

Profile of Kepler-452b

这颗行星被命名为“开普勒452b”,是开普勒太空望远镜新发现的12颗宜居带行星的其间之一,这些行星的直径均为地球的1到2倍。其间开普勒452b的直径比地球大60%。

开普勒452b的发现 已承认戏外行星的数量添加到了1030颗。

这颗行星坐落间隔地球1400光年的天鹅座,绕着一颗与太阳极为类似的恒星运转。那颗行星的质量比太阳多4%,亮度多10%。开普勒452b和那颗恒星之间的间隔,与地球到太阳的间隔相同。开普勒452b上的一年大约为385天。

美国航天局猜测,在这个星球上,有或许存在大气层和活动水,而且温度也或许比较适合类似人类的生命生计。

Kepler-452b, located in the constellation Cygnus which is 1,400 light years from the Earth, is one of the 12 exoplanet candidates discovered with diameters between 1 to 2 times that of the Earth.

All of those candidates orbit in the so-called habitable zones of their host stars, where conditions are not too hot or cold, enabling them to potentially support life.

NASA experts have predicted that there might be liquid water and air atmosphere on the planet's surface, and the temperature might be suitable for aminimals similar to humans to survive.

Kepler 452b accompanies a star with characteristics very similar to those of the Sun - it is 4 percent larger in mass and 10 percent brighter. Kepler-452b orbits its star at the same distance as the Earth orbits the Sun.

It takes 385 days for Kepler-452b to travel around its parent star, which means a year on the planet is 5 percent longer than that on Earth.

路漫漫其修远兮

Still a Long Way to Go

美国航天局称,由于开普勒太空望远镜仅仅测定出开普勒452b的直径巨细,但质量仍不知道,因而无法测出它的密度。这样一来,现在还不能判别这颗行星是否像地球相同,是一颗岩石行星,故而称其为“别的一个地球”还为之过早。

不过,开普勒452b的发现仍是具有重大含义的,它是人类为完成寻觅“另一个地球”的愿望而迈出的重要一步,具有里程碑式的含义。

However, the new breakthrough does not mean another "Earth" has been discovered, since the Kepler space telescope could only measures the planet's size and its distance from its parent star. The mass and the density of Kepler 452b has yet to be measured.

Therefore, scientists can't determine whether the planet is a rocky planet like the Earth, making the label "another Earth" pre-mature.

But NASA still believes that the discovery is a milestone, taking us one step closer to "finding another Earth".

“另一个地球”探究之路

The Road to Exploring Habitable Planets

2009年3月,美国航天局发射了开普勒航天望远镜。6年以来,这台望远镜在探究“另一个地球”之路取得了一系列丰硕成果。

2011年12月,望远镜发现了两颗和地球类似的星球——开普勒20e和开普勒22b。

开普勒20e比地球小,相同围着一棵和太阳类似的恒星公转,可是它的地表温度极高,到达726摄氏度,因而或许不会有生命,包含大气层和液态水存在。

开普勒22b比地球大,间隔地球600光年远,地表温度只要22摄氏度。可是现在,这颗星球是否像地球相同,是一颗岩石行星,还不得而知。

NASA's Kepler space telescope was launched in March 2009. It has accumulated a list of accomplishments in the past six years.

In December 2011, two planets similar to the Earth were found - the Kepler-20e and the Kepler-22b.

Kepler-20e, smaller than the Earth, orbits a Sun-like star slightly cooler and smaller than the Sun. But the surface temperature on the planet reaches 726 degrees Celsius, making the existence of life, atmosphere and liquid water unlikely.

Kepler-22b is more than twice the size of the Earth and 600 light years from it. The surface temperature is only 22 degrees Celsius. But it's still not known whether it's a rocky star like the Earth.

开普勒186f在2014年4月被发现,它是一颗盘绕红矮星开普勒186的太阳系外行星,间隔地球约492光年。该行星是第一颗在太阳以外恒星旁发现的适居带内半径与地球相若的系外行星。

开普勒186星系与kepler-452b地点的星系,太阳系比较。 开普勒186体系的恒星由于比太阳小许多,所以它的首要行星简直都很接近恒星,大约和咱们太阳系的水星轨迹适当。

Kepler-186f was discovered in April 2014, and it's 492 light years away from the Earth.

It is the first Earth-size planet found in the habitable zone of a small, cool M dwarf about half the size and mass of our Sun.

Kepler-186 is a miniature solar system that would fit entirely inside the orbit of Mercury. The habitable zone of Kepler-186 is very small compared to that of Kepler-452 or the Sun because it is a much smaller and cooler star.

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