<div><span style="font-size:11pt;"><span style="font-size:11pt;"><span style="font-size:11pt;">출처 : <a target="_blank" href="http://top10.99doci.com/bbs/board.php?bo_table=board01&wr_id=192" target="_blank">http://top10.99doci.com/bbs/board.php?bo_table=board01&wr_id=192</a> (TOP 10 FACTS 어플)</span></span></span></div> <div><span style="font-size:11pt;"></span> </div> <div><span style="font-size:11pt;"></span> </div> <div> </div> <div> </div> <div><span style="font-size:11pt;"></span> </div> <div><span style="font-size:11pt;">외계인은 도대체 어디에 있을까? 페르미 역설!</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​</span><span style="font-size:11pt;"><br style="clear:both;"><img title="782aaacb65cbc528f6573bd67f5c553d_1524124652_8121.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524124652_8121.jpg" alt="" filesize="150701"></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">과연 우리가 전 우주에서 유일한 생명체일까?</span></div> <div><span style="font-size:11pt;">관측 가능한 우주는 무려 직경 930광년이고, </span></div> <div><span style="font-size:11pt;">​</span><span style="font-size:11pt;">그 안에는 최소 천억 개의 은하들이 있으며, </span></div> <div><span style="font-size:11pt;">그 은하에는 각각 수천 억 개의 항성이 존재한다. </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><br></span></div> <div><span style="font-size:11pt;">​<img title="782aaacb65cbc528f6573bd67f5c553d_1524124652_0008.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524124652_0008.jpg" alt="" filesize="176787"></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">그리고 행성도 매우 흔해서, </span><span style="font-size:11pt;">우주엔 수십조 개의 </span></div> <div><span style="font-size:11pt;">거주 가능한 행성들이 </span><span style="font-size:11pt;">존재한다고 추정된다.</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">압도적인 우주의 크기와 나이를 따져봤을 때, </span></div> <div><span style="font-size:11pt;">우리의 문명을 초월하는 지적생명체는 우주에 </span></div> <div><span style="font-size:11pt;">넘쳐나야 정상이다. 그런데 모두 어디에 있을까?</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">이 물음의 시작이 바로 페르미 역설이다.</span></div> <div><span style="font-size:11pt;">다시 말해, 외계 문명의 존재는 너무나 당연해 보이나, </span></div> <div><span style="font-size:11pt;">어째서인지 우리는 지금껏 외계 문명의 흔적조차 </span></div> <div><span style="font-size:11pt;">찾은 적이 없기 때문이다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><span>​</span></span></div> <div><span style="font-size:11pt;"><span>​<img title="782aaacb65cbc528f6573bd67f5c553d_1524124843_7069.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524124843_7069.jpg" alt="" filesize="64312"></span></span></div> <div><span style="font-size:11pt;"><span>​</span></span></div> <div><span style="font-size:11pt;"><span>​</span>우주엔 외계함선이 가득 차있어야 하지 않을까? </span></div> <div><span style="font-size:11pt;">또 몇몇 고등 문명을 가진 종족들 끼리 전쟁을 하거나 </span></div> <div><span style="font-size:11pt;">우리은하는 이미 식민지화가 됐어야 하지 않을까? </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">결국 페르미 역설은 외계 문명의 문제를 해결하기 </span></div> <div><span style="font-size:11pt;">위해서는 반드시 거쳐야 하는 필수통과점이 되었다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">페르미 역설에 대한 대답으로 여러 가지 의견이 있다. </span></div> <div><span style="font-size:11pt;">한번 알아보도록 하자.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">1. 외계인은 이미 우리 곁에 있다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;"><br></span></div> <div><span style="font-size:11pt;">​<img title="782aaacb65cbc528f6573bd67f5c553d_1524125334_2936.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524125334_2936.jpg" alt="" filesize="43600"></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">맨인블랙 같은 얘기가 아니라, <strong>동물원 가설</strong>을 말하는건데, </span></div> <div><span style="font-size:11pt;">동물원 가설이란, 이미 고도의 외계 문명이 오래 전에 </span></div> <div><span style="font-size:11pt;">우리은하를 정복했고 그들이 한 구역에 자연보호구역 </span></div> <div><span style="font-size:11pt;">혹은 동물원을 설치했는데 그 구역 안에 지구가 </span></div> <div><span style="font-size:11pt;">있다는 것이다. </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">그들은 이 구역 내에 어떠한 간섭도 하지 못하도록 </span></div> <div><span style="font-size:11pt;">어떤 조치를 취해서 개발되지 않은 우주를 연구 혹은 </span></div> <div><span style="font-size:11pt;">관광 목적으로 보존하려 한다. 이 가설이 사실이라면 </span></div> <div><span style="font-size:11pt;">외계인 관리자가 우리를 지속적으로 관찰하며 문명 </span></div> <div><span style="font-size:11pt;">발달 수준과 개체 수 등을 분석하고 있을 수도 있다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">2. 외계인은 존재하나 통신이 안 된다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​<img title="782aaacb65cbc528f6573bd67f5c553d_1524125699_6379.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524125699_6379.jpg" alt="" filesize="43133"></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">전파의 전달 속도가 광속을 넘을 수 없다는 한계에서 </span></div> <div><span style="font-size:11pt;">비롯된 설이다. 우주 어딘가에 있기는 하나, 아직 </span></div> <div><span style="font-size:11pt;">연락할만한 기술이 없다는 것이다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">광속이라는 것은 지구 기준으로 볼 땐 아득하게 빠르지만, </span></div> <div><span style="font-size:11pt;">우주 기준에서는 비참할 정도로 느린 속도다. </span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">아래의 영상에선 유니버스 샌드박스를 활용해 시각적으로 </span></div> <div><span style="font-size:11pt;">광속을 구현했는데, 태양에서 나온 빛이 지구는 둘째 치고 </span></div> <div><span style="font-size:11pt;">수성에 도달하는 것조차 우리의 인내심을 시험한다.</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><iframe width="560" height="315" src="https://www.youtube.com/embed/1iGV3gzhwCU" frameborder="0"></iframe></span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">명왕성까지 도달하는 것을 보기 위해 시뮬레이터를 </span></div> <div><span style="font-size:11pt;">​</span><span style="font-size:11pt;">천 배만큼 가속해야 했다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><br></span></div> <div><span style="font-size:11pt;">​<img title="782aaacb65cbc528f6573bd67f5c553d_1524126202_9622.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524126202_9622.jpg" alt="" filesize="161549"><br style="clear:both;"> </span></div> <div><span style="font-size:11pt;">속도는 그렇다 치더라도 문제는 아직 많다. </span></div> <div><span style="font-size:11pt;">인류처럼 외계인도 다른 종족을 찾기 위해 전파를 </span></div> <div><span style="font-size:11pt;">여기저기 쏜다고 생각해 보자. 하지만 그 전파를 </span></div> <div><span style="font-size:11pt;">우리가 수신할 가능성은 과연 얼마나 될까? </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><span>​<img title="782aaacb65cbc528f6573bd67f5c553d_1524126181_4904.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524126181_4904.jpg" alt="" filesize="208587"></span></span></div> <div><span style="font-size:11pt;"><span><br></span></span></div> <div><span style="font-size:11pt;"><span>​</span>일례로 중력 렌즈 효과가 있는데, 강력한 중력장이 </span></div> <div><span style="font-size:11pt;">주변의 빛의 방향을 왜곡시켜 버린다. </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">또 블랙홀이나 다른 천체에 의해 전파 전송이 </span></div> <div><span style="font-size:11pt;">방해받을 수 있다.</span><span style="font-size:11pt;"> 마지막으로 서로가 위치, </span></div> <div><span style="font-size:11pt;">존재 자체를 모르기 때문에 사실상 전파를 </span></div> <div><span style="font-size:11pt;">난사하게 된다. </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">심지어 서로 위치를 확신해도 연락을 취하는 것은 </span></div> <div><span style="font-size:11pt;">불가능에 가깝다. 1mm의 오차도 그 거대한 우주에선 </span></div> <div><span style="font-size:11pt;">수백 수천 광년의 오차가 생겨버리기 때문이다. </span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">외계인이 우리의 신호를 받았어도 여전히 문제가 </span></div> <div><span style="font-size:11pt;">발생한다. 그 전파의 회신을 어떻게 할 것이며, </span></div> <div><span style="font-size:11pt;">우리가 어떻게 받을 수 있을지 말이다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">혹은 이미 외계인들의 문명 수준이 고도로 발달해서 </span></div> <div><span style="font-size:11pt;">인류가 지금 쓰고 있는 전파 통신과 같은 미개한 방식은 </span></div> <div><span style="font-size:11pt;">쓰지 않는다는 가설도 있다. </span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;"><br></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><img title="782aaacb65cbc528f6573bd67f5c553d_1524126239_0004.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524126239_0004.jpg" alt="" filesize="243637"></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">지구를 무인도, 전파를 바닷물이라고 생각해 보자. </span></div> <div><span style="font-size:11pt;">무인도에 고립된 한 사람이 유리병에 쪽지를 써서 </span></div> <div><span style="font-size:11pt;">바닷물에 띄웠다. </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">그것을 우연히 스마트폰으로 </span><span style="font-size:11pt;">카카오톡을 하던 </span></div> <div><span style="font-size:11pt;">육지 사람이 발견 한다 쳐도 </span><span style="font-size:11pt;">신경이나 쓸까? </span></div> <div><span style="font-size:11pt;"><strike>생각해보니 신기해서 신경 쓸듯.. 참 거지같은 비유였다.</strike></span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">3. 외계인은 우리에게 관심이 없다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">외계인이 우리의 존재를 감지해 냈지만, 다른 종족과의 </span></div> <div><span style="font-size:11pt;">소통에 아무 관심이 없을 수도 있다. 즉 엄청난 기술을 </span></div> <div><span style="font-size:11pt;">갖췄으나, 지성이나 자아가 전혀 없는 우주 개미를 </span></div> <div><span style="font-size:11pt;">상상해볼 수도 있다. </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><br></span></div> <div><span style="font-size:11pt;">​<img title="782aaacb65cbc528f6573bd67f5c553d_1524126566_4885.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524126566_4885.jpg" alt="" filesize="294804"></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">혹은 기술은 구석기 수준이지만, 예술만 하는 종족이 </span></div> <div><span style="font-size:11pt;">있을 수도 있다. 모든 외계 지성체가 기술 문명을 발달 </span></div> <div><span style="font-size:11pt;">시켰을 거란 생각은 지나친 비약이다. </span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">우리는 너무 인간적인 외계인만을 상상하는 경향이 있다. </span></div> <div><span style="font-size:11pt;">외계인이 우리가 상상조차 할 수 없는 너무나도 다른 </span></div> <div><span style="font-size:11pt;">생명체라면, 그들도 자신들 외의 생명체에 관심을 갖고 </span></div> <div><span style="font-size:11pt;">통신을 위해 노력할 것이라는 가정은 문제가 있다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><span>​</span>우주 문명에는 3단계의 척도가 있다.</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><br></span></div> <div><span style="font-size:11pt;">​<img title="782aaacb65cbc528f6573bd67f5c553d_1524126796_2283.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524126796_2283.jpg" alt="" filesize="161235"></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">1단계는 행성의 에너지를 100% 활용하는 것이다. </span></div> <div><span style="font-size:11pt;">​</span><span style="font-size:11pt;">현재 우리는 이를 73% 달성한 수준으로 앞으로 수백 년 </span></div> <div><span style="font-size:11pt;">안으로 1단계 문명에 도달할 것이다.</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><br></span></div> <div><span style="font-size:11pt;">​<img title="782aaacb65cbc528f6573bd67f5c553d_1524126817_0075.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524126817_0075.jpg" alt="" filesize="54184"></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">2단계 문명은 모항성의 에너지를 100% 활용할 수 있다. </span></div> <div><span style="font-size:11pt;">​</span><span style="font-size:11pt;">다이슨 구체 같은 공상과학이 필요하나 이론적으로는 </span></div> <div><span style="font-size:11pt;">가능하다.</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><br></span></div> <div><span style="font-size:11pt;"><br></span></div> <div><span style="font-size:11pt;">​<img title="782aaacb65cbc528f6573bd67f5c553d_1524126961_663.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524126961_663.jpg" alt="" filesize="246348"></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">3단계 문명은 은하 전체의 에너지를 조정할 수 있다. </span></div> <div><span style="font-size:11pt;">​</span><span style="font-size:11pt;">이 단계의 외계 종족은 우리에겐 아마 신처럼 보일 것이다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">그러나 과연 3단계 문명에 도달한 외계 종족이 과연 무엇을 </span></div> <div><span style="font-size:11pt;">위해 은하를 정복하려고 할지도 생각해 볼 필요가 있다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><br></span></div> <div><span style="font-size:11pt;">​<img title="782aaacb65cbc528f6573bd67f5c553d_1524126418_1606.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524126418_1606.jpg" alt="" filesize="46656"></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">그들은 어쩌면 연산력이 매우 큰 컴퓨터에 종 전체가 </span></div> <div><span style="font-size:11pt;">자기의 의식을 업로드해서 가상의 세계에서 살았거나, </span></div> <div><span style="font-size:11pt;">살고 있을지도 모른다. 죽음이 없는 완벽한 삶 속에서 </span></div> <div><span style="font-size:11pt;">영원을 경험하면서 말이다. </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">컴퓨터가 적색 왜성을 감쌀 경우, 이 컴퓨터는 </span></div> <div><span style="font-size:11pt;">약 10조년 동안 전력을 공급받을 수 있다. </span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">만약 이런 선택지가 있다면 그들은 은하계 정복이나, </span></div> <div><span style="font-size:11pt;">다른 문명과의 만남에 대해 전혀 관심이 없을 것이다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">4. 지구는 특별하고 희귀한 행성</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​<img title="782aaacb65cbc528f6573bd67f5c553d_1524127033_996.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524127033_996.jpg" alt="" filesize="84738"></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">블랙홀과 같은 우주 환경의 극단성과 가혹성, </span></div> <div><span style="font-size:11pt;">그리고 지구와 </span><span style="font-size:11pt;">태양계의 특별함 등이 논거로 주장된다. </span></div> <div><span style="font-size:11pt;">바로 희귀한 지구 가설이다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><br></span></div> <div><span style="font-size:11pt;">​<img title="782aaacb65cbc528f6573bd67f5c553d_1524127160_8624.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524127160_8624.jpg" alt="" filesize="219453"></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">흔히 태양이 작은 별이라고 오해를 많이 하는데, </span><span style="font-size:11pt;">사실 <br><strong>태양은 상위 1%에 들 정도로 크고 밝은 항성이다.</strong> </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">태양보다 작고 밝기도 낮은 적/갈색 왜성이 항성의 </span></div> <div><span style="font-size:11pt;">90%를 </span><span style="font-size:11pt;">차지하는데, 이러한 항성은 골디락스 존</span></div> <div><span style="font-size:11pt;">(생명체가 생겨날 </span><span style="font-size:11pt;">수 있는 궤도)이 항성과 너무 가까이 </span></div> <div><span style="font-size:11pt;">형성되므로 대부분의 </span><span style="font-size:11pt;">행성이 조석력으로 고정되어 </span></div> <div><span style="font-size:11pt;"><strong>한쪽면만 항성을 바라보는 </strong></span><span style="font-size:11pt;"><strong>상태</strong>가 된다. </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">이런 행성은 생명체가 생기기 어렵다는 것이 정설. </span></div> <div><span style="font-size:11pt;">생긴다 해도 지적 생명체가 나올 수준은 아닐 것이다. </span></div> <div><span style="font-size:11pt;">일단 90%의 항성부터 믿고 걸러야 한다는 뜻이다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">무생물 → 단세포 생물 → 다세포 생물 → 지적 생명체의 </span></div> <div><span style="font-size:11pt;">과정에는 아주 넘기 힘든 세 개의 고비가 있다. </span></div> <div><span style="font-size:11pt;">이 중 한두 개는 어찌어찌 가능하더라도 세 개의 고비를 </span></div> <div><span style="font-size:11pt;">모두 넘을 확률을 매우 희박해 지구가 유일할 지도 모른다. </span></div> <div><span style="font-size:11pt;">​아래의 영상은 이에 대해 설명한다.</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><iframe width="560" height="315" src="https://www.youtube.com/embed/jh9j0ISFwwc" frameborder="0"></iframe></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​</span></div> <div><img title="782aaacb65cbc528f6573bd67f5c553d_1524128221_5199.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524128221_5199.jpg" alt="" filesize="181701"><br style="clear:both;"><span style="font-size:11pt;"></span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">물론 이 0에 가까운 확률에 무한 시행이 더해지면 일어날 </span></div> <div><span style="font-size:11pt;">가능성은 존재한다. 하지만 그 일어날 가능성이 무한시행을 </span></div> <div><span style="font-size:11pt;">통해 딱 한번 당첨된 것이 '인류'일 수도...</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">그리고 NASA가 2015년 10월 20일 발표한 연구에 따르면 </span></div> <div><span style="font-size:11pt;">94%의 지구형 행성은 아직 태어나지도 않은 상태라고 한다. </span></div> <div><span style="font-size:11pt;">이는 NASA의 허블 우주망원경과 케플러 우주망원경으로 </span></div> <div><span style="font-size:11pt;">수집한 정보에 기반 한 것이다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">따라서 인류는 우주의 <strong>초창기 지성체</strong>일 가능성이 높다는 </span></div> <div><span style="font-size:11pt;">결론에 다다를 수 있다. </span></div> <div><span style="font-size:11pt;">그토록 젤나가를 찾아 헤맸는데 우리가 젤나가 일지도...</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;"><br></span></div> <div><span style="font-size:11pt;">​<img title="782aaacb65cbc528f6573bd67f5c553d_1524128788_5799.jpg" src="http://top10.99doci.com/data/editor/1804/782aaacb65cbc528f6573bd67f5c553d_1524128788_5799.jpg" alt="" filesize="129119"><br style="clear:both;"> </span></div> <div><span style="font-size:11pt;">혹은 이미 고도의 문명을 갖췄던 외계 종족들이 모두 </span></div> <div><span style="font-size:11pt;">멸망했다는 가설도 있다. 이 가설도 그럴싸한데, 우주의 </span></div> <div><span style="font-size:11pt;">나이가 얼마나 많은지, 그리고 인류 문명이 우주적 </span></div> <div><span style="font-size:11pt;">기준에서는 찰나에 불과한 수천년간 얼마나 빠르게 </span></div> <div><span style="font-size:11pt;">발전했는지 생각해보자. </span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">외계 문명이 가령 10억 년 전에 탄생했었다면, </span></div> <div><span style="font-size:11pt;">이미 그들이 우리 은하를 모두 식민지화 시켰어야 한다. </span></div> <div><span style="font-size:11pt;">그러나 그렇지 않다는 것은 외계 문명이 존재한 적이 </span></div> <div><span style="font-size:11pt;">없다던가, 존재 했지만 그정도로 발전하기도 전에 </span></div> <div><span style="font-size:11pt;">이미 멸망해버렸다고 생각할 수도 있다.</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">이 주장대로라면 우주에는 수많은 문명이 존재했고 </span></div> <div><span style="font-size:11pt;">​</span><span style="font-size:11pt;">앞으로도 생길 것이지만, 그들은 결코 가까운 거리 내에서 </span></div> <div><span style="font-size:11pt;">동시에 존재할 수 없기에 모든 문명은 <strong>이 페르미 역설을</strong></span></div> <div><span style="font-size:11pt;"><strong>고민했을 것이다.</strong> 그리고 고민을 시작한지 얼마 지나지 </span></div> <div><span style="font-size:11pt;">않아 해결하지 못한 채 멸망한다. </span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;">영국의 물리학자 브라이언 콕스는 페르미 역설에 대해 </span></div> <div><span style="font-size:11pt;">​</span><span style="font-size:11pt;">다음과 같은 답을 제시했다.</span></div> <div><span style="font-size:11pt;">​</span></div> <div><span style="font-size:11pt;">​</span><span style="font-size:11pt;">“자기 자신을 파괴 할 수 있는 힘을 지닌 문명은 죄다 </span></div> <div><span style="font-size:11pt;">스스로 자멸해버리기 때문에 우리가 다른 외계 문명을 </span></div> <div><span style="font-size:11pt;">찾아내지 못하는 것이다.”</span></div> <div><span style="font-size:11pt;"> </span></div> <div><span style="font-size:11pt;"><strong>이는 어쩌면 우리의 가까운 미래가 될지도 모른다.</strong></span></div> <div><span style="font-size:11pt;"></span> </div> <div><span style="font-size:11pt;"></span> </div><span style="font-size:11pt;"> </span><div><span style="font-size:11pt;"></span> </div> <div><span style="font-size:11pt;">[신기한 사실들 더 보기]</span></div> <div><span style="font-size:11pt;"></span> </div> <div><span style="font-size:11pt;">(영상) 영원히 살 수 있을까?</span></div> <div><span style="font-size:11pt;"><a target="_blank" href="http://top10.99doci.com/bbs/board.php?bo_table=board02&wr_id=52" target="_blank">http://top10.99doci.com/bbs/board.php?bo_table=board02&wr_id=52</a></span></div> <div><span style="font-size:11pt;"></span> </div> <div><span style="font-size:11pt;">(영상) 소름 돋는 블랙홀의 크기</span></div> <div><span style="font-size:11pt;"><a target="_blank" 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