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O cientista produziu um document\u00e1rio em que ele e seu antigo aluno Christophe Galford viajam pelo mundo para descobrir como poder\u00edamos viver <em>off-planet <\/em>\u2013 ou seja, em outro planeta.<\/p>\n<p>Mesmo se for encontrada vida em outro lugar do nosso Sistema Solar, n\u00e3o ser\u00e1 uma simples quest\u00e3o de &#8220;todos a bordo e tchau&#8221;. Sabe-se que os seres humanos t\u00eam dificuldades para sobreviver no espa\u00e7o. Estamos perfeitamente adaptados \u00e0 Terra, e ela est\u00e1 perfeitamente adaptada a n\u00f3s, n\u00e3o importa quanto tentemos destru\u00ed-la. O espa\u00e7o, por outro lado, n\u00e3o \u00e9 um habitat humano por natureza.<\/p>\n<p>Astronautas vivenciam isso na Esta\u00e7\u00e3o Espacial Internacional (ISS), por exemplo. Seus m\u00fasculos e ossos se expandem, o que pode ser doloroso. Ainda pior \u00e9 a degrada\u00e7\u00e3o \u00f3ssea. Apesar de astronautas serem submetidos a rotinas de exerc\u00edcios regulares quando est\u00e3o em \u00f3rbita, leva tempo para que seus corpos se reajustem quando eles retornam \u00e0 Terra.<\/p>\n<p>Um n\u00famero significativo de astronautas \u00e9 acometido por problemas de vis\u00e3o, desde vista emba\u00e7ada at\u00e9 cegueira. E os cientistas n\u00e3o sabem o motivo. Talvez maior press\u00e3o dos flu\u00eddos na cabe\u00e7a e no nervo \u00f3tico?<\/p>\n<p>H\u00e1 ainda o mal-estar generalizado que se sente no espa\u00e7o. Em 1985, quando o ent\u00e3o senador dos EUA Jake Garn voou num \u00f4nibus espacial, ele se sentiu t\u00e3o mal que n\u00e3o conseguiu fazer nada durante toda a viagem. Ent\u00e3o, astronautas, que n\u00e3o gostam de admitir que n\u00e3o t\u00eam jeito para o espa\u00e7o, criaram uma nova unidade de medida: o garn. Um garn \u00e9 quando se est\u00e1 &#8220;totalmente doente e totalmente incompetente&#8221;. A maioria dos astronautas sente at\u00e9 um d\u00e9cimo de garn.<\/p>\n<p><strong>Para onde iria a evolu\u00e7\u00e3o?<\/strong><\/p>\n<p>A quest\u00e3o ent\u00e3o passa a ser se pessoas normais t\u00eam jeito para o espa\u00e7o. H\u00e1 alguns pontos a considerar. Se os <strong>ossos<\/strong> humanos se deterioram, ser\u00e1 que passar\u00edamos por um processo de evolu\u00e7\u00e3o no espa\u00e7o que resultaria na perda deles? Poder\u00edamos nos tornar seres amorfos, que respondem melhor \u00e0 microgravidade? Na Terra, a vida come\u00e7ou h\u00e1 3,8 bilh\u00f5es de anos, com o surgimento dos dom\u00ednios Bacteria e Archaea \u2013 ambos sem ossos.<\/p>\n<p>Se os seres humanos s\u00e3o propensos \u00e0<strong> vis\u00e3o<\/strong> turva ou mesmo \u00e0 cegueira espacial, talvez tenhamos que evoluir para uma vida sem olhos? Que outros sentidos podem estar em jogo? Pensemos na <strong>audi\u00e7\u00e3o<\/strong>. Na Terra, ondas sonoras viajam ao causar vibra\u00e7\u00f5es, e s\u00e3o as vibra\u00e7\u00f5es que percebemos. Mas o espa\u00e7o \u00e9 um v\u00e1cuo, onde as ondas sonoras n\u00e3o podem vibrar. Ent\u00e3o n\u00e3o h\u00e1 som. O que poderia substituir esse sentido?<\/p>\n<p>Falando em v\u00e1cuo, como seria a <strong>respira\u00e7\u00e3o<\/strong> no espa\u00e7o? Usar um traje espacial volumoso e um capacete o tempo todo n\u00e3o \u00e9 nada agrad\u00e1vel. Mas remover o acess\u00f3rio de cabe\u00e7a no espa\u00e7o levaria \u00e0 asfixia quase instant\u00e2nea. Ser\u00e1 que evoluiremos ao ponto de n\u00e3o precisar mais de oxig\u00eanio? As bact\u00e9rias viveram na Terra por 1,4 bilh\u00e3o de anos antes do chamado grande evento de oxigena\u00e7\u00e3o, quando o oxig\u00eanio come\u00e7ou a se acumular em nossa atmosfera. Seria poss\u00edvel retornarmos a um estado pr\u00e9-oxig\u00eanio?<\/p>\n<p>O <strong>mal-estar <\/strong>espacial, por sua vez, \u00e9 semelhante ao chamado enjoo de movimento ou cinetose, quando h\u00e1 confus\u00e3o entre a vis\u00e3o e o sistema vestibular, respons\u00e1vel pelo equil\u00edbrio. Caso passemos a existir sem o sentido da vis\u00e3o, pode ser que o problema do mal-estar no espa\u00e7o seja resolvido. Mas se esse n\u00e3o for o caso, os futuros seres humanos amorfos evoluir\u00e3o a ponto de girar lenta e constantemente para contrabalancear qualquer desequil\u00edbrio?<\/p>\n<p><strong>Futuro improv\u00e1vel<\/strong><\/p>\n<p>Ralph Tiedemann, professor e l\u00edder de uma unidade de biologia evolutiva na Universidade de Potsdam, na Alemanha, concorda com Hawking quanto aos problemas graves que enfrentamos na Terra. Mas ele n\u00e3o espera que os seres humanos entrem em extin\u00e7\u00e3o &#8220;dada sua intelig\u00eancia, capacidade de aprender e versatilidade&#8221;.<\/p>\n<p>Para ele, a sobreviv\u00eancia humana fora do planeta \u00e9 algo muito mais dif\u00edcil de imaginar. &#8220;De uma perspectiva evolucion\u00e1ria, o per\u00edodo mencionado [cem anos] \u00e9 curto demais para esperar qualquer adapta\u00e7\u00e3o evolucion\u00e1ria, e a probabilidade de que um organismo complexo como o humano se adapte a um mundo completamente diferente me parece baixa&#8221;, afirma.<\/p>\n<p>Axel Meyer, chefe do departamento de biologia evolutiva da Universidade de Constan\u00e7a, no sul da Alemanha, tem uma vis\u00e3o semelhante. &#8220;A vida, inclusive da nossa esp\u00e9cie, evoluiu no nosso planeta moldada por muta\u00e7\u00f5es aleat\u00f3rias e sele\u00e7\u00e3o n\u00e3o aleat\u00f3ria&#8221;, diz o professor. &#8220;As press\u00f5es de sele\u00e7\u00e3o no espa\u00e7o seriam muito diferentes \u2013 sem oxig\u00eanio, temperaturas, radia\u00e7\u00e3o, etc. Os seres humanos morreriam imediatamente.&#8221;<\/p>\n<p>Para Meyer, o melhor \u00e9 tentar n\u00e3o destruir o nosso planeta. &#8220;N\u00e3o temos futuro algum num planeta diferente. Este \u00e9 o nosso lar. \u00c9 aqui que evolu\u00edmos e aonde pertencemos.&#8221;<\/p>\n<p>&nbsp;<\/p>\n<\/section>\n<\/article>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>O cientista Stephen Hawking, conhecido por pronunciamentos sobre a exist\u00eancia humana de dar medo, afirmou<\/p>\n","protected":false},"author":6,"featured_media":65458,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"uagb_featured_image_src":{"full":["https:\/\/espacoecologico.com.br\/arquivo\/wp-content\/uploads\/2017\/05\/espaco.jpg",415,265,false],"thumbnail":["https:\/\/espacoecologico.com.br\/arquivo\/wp-content\/uploads\/2017\/05\/espaco-150x150.jpg",150,150,true],"medium":["https:\/\/espacoecologico.com.br\/arquivo\/wp-content\/uploads\/2017\/05\/espaco-300x192.jpg",300,192,true],"medium_large":["https:\/\/espacoecologico.com.br\/arquivo\/wp-content\/uploads\/2017\/05\/espaco.jpg",415,265,false],"large":["https:\/\/espacoecologico.com.br\/arquivo\/wp-content\/uploads\/2017\/05\/espaco.jpg",415,265,false],"1536x1536":["https:\/\/espacoecologico.com.br\/arquivo\/wp-content\/uploads\/2017\/05\/espaco.jpg",415,265,false],"2048x2048":["https:\/\/espacoecologico.com.br\/arquivo\/wp-content\/uploads\/2017\/05\/espaco.jpg",415,265,false],"cream-magazine-thumbnail-2":["https:\/\/espacoecologico.com.br\/arquivo\/wp-content\/uploads\/2017\/05\/espaco.jpg",415,265,false],"cream-magazine-thumbnail-3":["https:\/\/espacoecologico.com.br\/arquivo\/wp-content\/uploads\/2017\/05\/espaco.jpg",415,265,false],"cream-magazine-thumbnail-4":["https:\/\/espacoecologico.com.br\/arquivo\/wp-content\/uploads\/2017\/05\/espaco.jpg",415,265,false]},"uagb_author_info":{"display_name":"","author_link":"https:\/\/espacoecologico.com.br\/arquivo\/author\/"},"uagb_comment_info":0,"uagb_excerpt":"O cientista Stephen Hawking, conhecido por pronunciamentos sobre a exist\u00eancia humana de dar medo, afirmou","_links":{"self":[{"href":"https:\/\/espacoecologico.com.br\/arquivo\/wp-json\/wp\/v2\/posts\/65457"}],"collection":[{"href":"https:\/\/espacoecologico.com.br\/arquivo\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/espacoecologico.com.br\/arquivo\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/espacoecologico.com.br\/arquivo\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/espacoecologico.com.br\/arquivo\/wp-json\/wp\/v2\/comments?post=65457"}],"version-history":[{"count":0,"href":"https:\/\/espacoecologico.com.br\/arquivo\/wp-json\/wp\/v2\/posts\/65457\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/espacoecologico.com.br\/arquivo\/wp-json\/wp\/v2\/media\/65458"}],"wp:attachment":[{"href":"https:\/\/espacoecologico.com.br\/arquivo\/wp-json\/wp\/v2\/media?parent=65457"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/espacoecologico.com.br\/arquivo\/wp-json\/wp\/v2\/categories?post=65457"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/espacoecologico.com.br\/arquivo\/wp-json\/wp\/v2\/tags?post=65457"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}