젊고 희미한 태양 역설 by yoon

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· @yoon · (edited)
$42.62
젊고 희미한 태양 역설
https://steemitimages.com/0x0/https://steemitimages.com/0x0/https://steemitimages.com/DQmW7pxypVzm4GQ3BUoA483rjMNgauLetrq3aQ1KaGHddBA/image.png

<center> 달과 기린을 그려주신 @leesongyi 작가님 고맙습니다. </center> 

***

대충돌 이후 1억년이 지나고
지구에 푸른 바다가 만들어졌다.
 
과학자들은 호기심이 많다.

처음부터 바다는 짰을까?
그럴 가능성이 높다.

지금보다 두 배나 더.

소금을 구성하는 `염화나트륨NaCl`은
원시대기에서 비가 내려
처음 바다가 생길 때 전부 물에 녹았을 것이다.
 
그러다 시간이 흘러

바다였던 곳이 육지가 되며
육지의 돌소금이 된다. `돌소금=암염`

![](https://steemitimages.com/DQmTo94ojDaX1RjuKDD58fmz18gazcRcdeDoxyMo5fwiUWf/image.png)

*암염*
*Image Credit : Wikimedia Commons*

> 히말라야도 바다였고,
우유니 소금 사막도 바다였던 곳이 솟아오른 곳이야.

https://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Salar_uyuni_200701.jpg/800px-Salar_uyuni_200701.jpg

*우유니 소금 사막*
*By The original uploader was Chechevere at English Wikipedia [CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons*

> 너무 환상적이다!

전 세계 소금 절반이 암염에서 나온다.

> 소금이 바다에서만 나오는 게 아니었네?

> 의외지?

그렇게 육지에 묶인 NaCl이 많아지며
바다의 염도가 점차 낮아진 걸로 추정한다.

바다가 만들어지고(44억년 전)
얼마 지나지 않아(38억년 전~43억년 전)

> 1억년~6억년 지난 후인데?

> 원래 지구과학에서 몇 억년은 우스워.

심해 열수구에서 
최초 생명이 탄생한 걸로 추측하는데
문제가 하나 있다.

태양계 탄생 초기 
태양은 지금보다 훨씬 어두웠다.

태양과 같은 항성은 일생 동안
천천히 조금씩 밝아진다.

44억년 전에는 지금보다 30%나 어두웠던 걸로
보이는데 그 정도라면

지구는 꽁꽁 얼어붙어 있어야 한다.

http://image.chosun.com/sitedata/image/201703/22/2017032203681_0.jpg

*Image Credit : NASA*

그런데 어떻게 지구에
물이 있었던 걸까?
 
과학자들은 이를 `젊고 희미한 태양 역설`이라 부른다.
`faint young Sun paradox`

> 과학자 : 어려운 문제다.
그러나 우린 답을 찾을 것이다. 늘 그랬듯이.

![](https://steemitimages.com/DQmVYa6QuHPS9BcvRdQAAG4gcEEFHrQ1syrZTLQpJYdf4iG/image.png)

한 가지 가능한 시나리오는
지구 형성 초기에는 이산화탄소의 농도가 높아

`오늘날 400ppm의 수천 배`

비닐 하우스에 들어간 것처럼
지구가 따뜻하게 유지되었다는 것이다.

> 다른 시나리오도 몇 개 더 있긴 한데
현재로서는 온실 효과가 가장 유력한 이론이다!

***
읽고 잘못된 내용이 있으면 알려주시는 분에게는 tipU :)

#kr-science 태그에서 다양한 과학 글을 만나실 수 있습니다.
***

### 과학 글 더 보기

**<천문학/지구과학>**
[지구 밖 푸른 행성](https://steemit.com/kr-science/@yoon/blue-planet-outside-earth)
[명왕성을 잊지 말자](https://steemit.com/kr-science/@yoon/45zqba)
[카이퍼 벨트와 오르트 구름](https://steemit.com/science/@yoon/kuiper-belt-and-oort-cloud)
[인간이 도달한 유일한 천체, 달](https://steemit.com/science/@yoon/the-only-astronomical-object-on-which-humans-arrived-moon)
[하루는 짧고 날은 많았던 지구의 1년](https://steemit.com/science/@yoon/rnwy4-1)
[인류가 달의 뒷면을 보기까지](https://steemit.com/science/@yoon/5qjyv9)
[인류는 결코 달에 간 적이 없다?](https://steemit.com/kr-science/@yoon/3dszqe)
[그림자가 그린 그림](https://steemit.com/kr-science/@yoon/6ssakc)
[달은 언제 어떻게 만들어졌을까?](https://steemit.com/kr-science/@yoon/4rgi4b)
[만약 달이 없다면?](https://steemit.com/kr-science/@yoon/what-if-the-moon-didn-t-exist)
[지구 : 지질시대의 서막](https://steemit.com/kr-science/@yoon/9nsr9)
[모래 알갱이 하나가 들려주는 이야기](https://steemit.com/kr-science/@yoon/4dau4p)

**<도전 : 양자역학>**
[알파-베타-감마](https://steemit.com/kr-science/@yoon/4mmwvg)
[원자를 들여다보다](https://steemit.com/kr-science/@yoon/4fm7vn-2)
👍  , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,
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vote details (61)
@chocomuscake ·
대문 이쁘네요.  지구의 바다는 참으로 신비롭네요. 왜 짤까요? 왜 물이 생겼을까요? 등등... 포스팅 잘보고 갑니다. 과학글도 잘보고 갑니다.
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@yoon ·
대문 @leesongyi 님께서 너무 예쁘게 그려주셨습니다. 읽어주셔서 감사합니다.
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@sunbahri ·
$0.36
Content is very interesting friends. It turns out you also glance at the birth of the sea and the great world changes. I love it. I also have a post about salt in the ocean. Hope you will share with me. Thanks
👍  
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@yoon ·
thank you for your interest.
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@sunbahri ·
Welcome. Please visit my wall. I hope you want to see my post too
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@ionlysaymeep ·
meep
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@sunshineyaya7 ·
이송이님이 만들어주신 대문 창문 커튼으로 나오면
바로 살것 같아요 ㅋㅋ''
소금과 물에 관한 포스팅 잘 읽고 갑니다^^
역시...지구에 관한 이야기는...
신비롭군용,,
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@yoon ·
커튼으로 걸어두어도 참 좋을 거 같습니다. ㅎㅎ 재미있게 읽어주셔서 감사합니다. 참 신비하죠.
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@kanade1025 ·
scienece 태그도 있었네요 ㅎㅎ
잘보고 갑니다
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@yoon ·
네. #kr-science 종종 들러주세요. 감사합니다. tip!
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@tipu ·
<table><tr><td>http://i.imgur.com/IFF4CSc.jpg</td><td><p><strong>Hi @kanade1025! You have just received 0.3 SBD tip from @yoon!</strong></p><hr><p><a href="https://steemit.com/steemit/@tipu/tipu-quick-guide" rel="noopener">@tipU quick guide</a> |  How to check your <a href="https://steemit.com/steemit/@tipu/cool-steem-tools-check-your-pending-payouts-with-charts" rel="noopener">pending payouts.</a></p></td></tr></table>
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@regex.hater ·
 
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@kimsungmin ·
안녕하세요 yoon님, 간결하고 내용도 쉽게 잘 설명해 주셔서 잘 보고 가네요.. 감사합니다~~
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@yoon ·
성민님께서 재미있게 읽어주셔서 고맙습니다. tip!
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@kimsungmin ·
아 네 감사합니다~~^^
properties (22)
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@tipu ·
<table><tr><td>http://i.imgur.com/IFF4CSc.jpg</td><td><p><strong>Hi @kimsungmin! You have just received 0.3 SBD tip from @yoon!</strong></p><hr><p><a href="https://steemit.com/steemit/@tipu/tipu-quick-guide" rel="noopener">@tipU quick guide</a> |  How to check your <a href="https://steemit.com/steemit/@tipu/cool-steem-tools-check-your-pending-payouts-with-charts" rel="noopener">pending payouts.</a></p></td></tr></table>
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@johnsmit ·
Great post 
Thanks for submit
Upvoted
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@skt1 ·
나사의 저 얼어있는 지구 사진을 한참 바라본것 같아요.. ^^
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@yoon ·
실제 사진은 아니지만 무척 신비롭고 아름답습니다 ^^
properties (22)
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@happadai ·
오 사실 처음부터 바다가 잘까??라는 거에 대해서 고민해본적이 없었는데 흥미롭게 잘 읽었습니다 :) science분야 글을 이렇게 쉽게 읽힐 수 있게 적어주셔서 감사합니다 ★
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@yoon ·
무척 기분 좋아지는 말씀입니다. 쉽게 읽힌다니 다행입니다. ㅎㅎ tip!
properties (22)
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@tipu ·
<table><tr><td>http://i.imgur.com/IFF4CSc.jpg</td><td><p><strong>Hi @happadai! You have just received 0.3 SBD tip from @yoon!</strong></p><hr><p><a href="https://steemit.com/steemit/@tipu/tipu-quick-guide" rel="noopener">@tipU quick guide</a> |  How to check your <a href="https://steemit.com/steemit/@tipu/cool-steem-tools-check-your-pending-payouts-with-charts" rel="noopener">pending payouts.</a></p></td></tr></table>
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@die.berliner ·
 
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@gabris ·
 
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@gasusa ·
 
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@rev.lav ·
 
properties (22)
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@the.giglio ·
$1.61
properties (23)
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vote details (228)
@romi ·
송이님 대문이랑 너무 어울리는 글이네욤 >_</
얀님 글 잘보고 갑니다  ^0^/
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@yoon ·
감사합니다. :)
properties (22)
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authoryoon
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@bree1042 ·
바다가 짠 이유는 소금을 만들어내는 신기한 맷돌이 바다에 빠져서...라고 어릴적 동화에서 읽었습니다만. ㅎㅎㅎ 
옛날에 태양이 더 어두웠다면, 앞으로 더 밝아질거란 뜻인가요?
properties (22)
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@yoon ·
앞으로 더 밝아집니다 ^^
properties (22)
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@ghana531 ·
옛날 옛날에~ 하는 이야기 읽는 느낌이에요. 신기하기도 하고, 흥미롭습니다ㅎㅎ 사진들도 아름다워서 한참을 봤네요:)
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@yoon ·
ㅎㅎ 그런 느낌의 글도 참 좋을 거 같네요. 감사합니다.
properties (22)
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@s292153s ·
주말잘보내셨나요 윤님
포스팅해주신글 꼼꼼히 두번을 읽어보았는데아직은 어렵지만 더 열심히 볼게요!
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@yoon ·
두번이나 읽어주시다니 감사합니다. tip!
properties (22)
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@tipu ·
<table><tr><td>http://i.imgur.com/EbJKClP.png</td><td><p><strong>Hi @s292153s! You have just received 0.3 SBD tip from @yoon!</strong></p><hr><p><a href="https://steemit.com/steemit/@tipu/tipu-quick-guide" rel="noopener">@tipU quick guide</a> | <a href="https://steemit.com/steemit/@tipu/tipu-guide-4-sharing-the-profit-explained" rel="noopener">earn interest in @tipU profit</a></p></td></tr></table>
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@rev.lav ·
 
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@regex.hater ·
 
properties (22)
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@hkkim1030 · (edited)
지구 생성 초기에 미행성 충돌로 인해 지구의 크기가 커지면서 지구는 엄청나게 뜨거웠습니다. 이를 마그마바다라고 부릅니다.

미행성 충돌로 인해 생성된 원시 대기에 포함된 수증기와 마그마바다에  녹아있던 수증기들이 원시대기로 이동하여 비를 뿌려 원시 해양을 형성했습니다. 



이렇게 형성된 물은 지각의 여러 물질들을 녹여 염분을 포함한 짠물 변하게되었습니다. 또한, 열수분출도 바닷물을 짜게만드는데 도움을 주었구요. 

지구의 나이는 46억살로 추정하며 현존하는 가장 오래된 암석의 나이는 42억살입니다. 이를통해 지구의 바다는 42억년보다 젊다고할 수 있습니다. 

도움이 되었으면 합니다.
properties (22)
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json_metadata"{"app": "steemit/0.1", "tags": ["kr-science"]}"
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@yoon ·
@hkkim1030 님, 큰 도움이 되었습니다. 앞으로 올리는 글도 많은 도움을 받게 될 거 같습니다. 감사합니다. tip! 1
properties (22)
post_id10,683,394
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@hkkim1030 ·
아닙니다. ㅎㅎ 도움이 되셨으면 해요.
항상 잘 보고있습니다.^^
properties (22)
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@tipu ·
<table><tr><td>http://i.imgur.com/EbJKClP.png</td><td><p><strong>Hi @hkkim1030! You have just received 1.0 SBD tip from @yoon!</strong></p><hr><p><a href="https://steemit.com/steemit/@tipu/tipu-quick-guide" rel="noopener">@tipU quick guide</a> | <a href="https://steemit.com/steemit/@tipu/tipu-guide-4-sharing-the-profit-explained" rel="noopener">earn interest in @tipU profit</a></p></td></tr></table>
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@gabris ·
 
properties (22)
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@hunhani ·
스팀잇의 지구과학 글 하면 @yoon 님이 떠오르는 것 같습니다 ㅎㅎ
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