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Kepler-186f

作者:fanlaifuqu  於 2014-4-20 00:29 發表於 最熱鬧的華人社交網路--貝殼村

作者分類:隨筆|通用分類:熱點雜談|已有15評論

關鍵詞:太陽系, 科學家, 美國, 地球, 命名

美國太空署的科學家們辛苦工作多年,終於在太陽系外發現一顆與地球極為相似的行星. 目前命名為 Kepler-186f.

所有科學內容可見於下列原文。

Scientists who have been hunting for another Earth beyond our solar system have come across a planet that's remarkably similar to our world.

It's almost the same size as Earth, and it orbits in its star's "Goldilocks zone" — where temperatures are not too hot, not too cold, and maybe just right for life.

But a lot about this planet is going to remain a mystery, because it's 500 light-years away.

Researchers detected the planet while poring over data collected by . The telescope spent years staring at 150,000 stars, watching for telltale dips in brightness that might mean a planet was circling around a star.

One small star in the direction of the constellation Cygnus showed signs of five planets. Four of them are tucked in close to the star, so they're probably too hot for life.

But the fifth planet looked special.

"This planet orbits its star every 130 days," says of the SETI Institute and NASA's Ames Research Center. It's called Kepler-186f, and it's just 10 percent bigger than Earth.

At least in our solar system, Earth-sized planets are made of rock and iron and gas, says Quintana, "so we can guess that Kepler-186f, being so close in size to Earth, has a high probability of being rocky also and composed of those sorts of materials."

Conditions on the surface would depend on what kind of atmosphere it had, if any. If it was like Earth, temperatures wouldn't be balmy, Quintana says.

"Being on this planet would probably be like being in San Francisco on a cool day," she says. "It would be a much colder place to live."

It would be warm enough, however, for one thing that's thought to be essential for life. "If this planet had the right atmospheric conditions, and if there were water on the surface, it would be likely in liquid form," says Quintana.

But if it has oceans, they would look different.

"It's not going to have a deep rich blue ocean, such as we have, because there's less blue light coming from the star," says of NASA's Ames Research Center, another member of the team that . "So the ocean would probably be a duller, grayer blue."

And because this planet orbits a dim, red dwarf star, he notes that midday on this planet wouldn't be bright — it would look more like an hour before sunset on Earth.

"It's very romantic to imagine there'd be places out there that look like Earth, and that's what we're trying to find — places that remind us of Earth," Barclay says.

Although Kepler-186f shares characteristics with Earth, "it's not an Earth twin," he notes. "It isn't around the same type of star. It's perhaps more of an Earth cousin."

Still, it's the first time anyone has found an Earth-size planet in the habitable zone of a distant star, Barclay adds. "This is a really profound discovery. It's a major milestone."

Other experts on planets beyond our solar system agree that this discovery is a big deal.

"This planet really is the same size as the Earth and the same temperature," says of Harvard University. "Up until this point, planets satisfied one of those two, but we really didn't have one that was both those things together."

Both those things are key to life on Earth, Charbonneau says, but we'll probably never know if this new planet has life. "And the reason," he explains, "is that this star system is just too far away from us."

Even though this planet is too distant for follow-up work with other telescopes, it suggests similar worlds might be out there orbiting other red dwarf stars, which are very common.

If scientists could find another planet like this around a nearby star, he says, "we could really study the atmosphere and really figure out something about whether it truly is Earth-like and maybe whether it actually has life on the surface."

That's why Charbonneau and other scientists will keep searching for other Earth-like planets closer to home.

我的感想是,她離地球是500光年,如果地球發生問題,我們能移民的最近目的地就是她。算算距離吧,目前還沒有光速火箭(如果有需要飛500年),所以飛機應是比較實際的交通工具。目前的時速多為每小時1000公里左右。我算了一下,這速度要飛五億年,飛機上要裝太多的水和其他食物。


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剛表態過的朋友 (15 人)

發表評論 評論 (15 個評論)

回復 總裁判 2014-4-20 00:34
有人么?
回復 白露為霜 2014-4-20 00:56
準備移民。
回復 fanlaifuqu 2014-4-20 01:07
白露為霜: 準備移民。
怎麼去?我算了!
回復 白露為霜 2014-4-20 01:19
只有500光年。如果按光速飛行,500年就到了。更妙的是飛行員一點都沒變老,時間對他來說停止。唯一的問題是加速到光速比較難。
回復 亦云 2014-4-20 03:53
it's 500 light-years away
誰能活那麼長? 最好是生命停止衰老 在光速飛行器里就好了
回復 fanlaifuqu 2014-4-20 03:56
亦云: it's 500 light-years away
誰能活那麼長? 最好是生命停止衰老 在光速飛行器里就好了
說在光速推進器里還能返老還童!
回復 亦云 2014-4-20 04:03
fanlaifuqu: 說在光速推進器里還能返老還童!
像 熊 一樣冬眠 直到到達新地球 再蘇醒過來多好
回復 jc0473 2014-4-20 05:42
穿越是不受時間和距離限制的
回復 懶懶貓 2014-4-20 06:33
等找到蟲洞之門就可以移民去了,哈哈
回復 巍不足道 2014-4-20 07:02
好奇,有空去看看,一邊飛一邊傳種接代,子子孫孫那是無窮無盡的。
回復 徐福男兒 2014-4-20 07:10
飛過去了,那邊的「人」(或者叫什麼別的名字)不歡迎怎麼辦?
回復 yulinw 2014-4-20 10:58
   俺就不想了~·
回復 沁霈 2014-4-20 11:33
哈哈,霍金早就在思考這個問題啦。
回復 sissycampbell 2014-4-21 12:17
要沒水怎麽辦?五百光年到哪裡,甚麽都沒有了。連灰都留不下。。。誰是pioneer?
回復 病枕軛 2014-4-21 22:26
  

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