{"id":2558,"date":"2018-01-28T11:20:38","date_gmt":"2018-01-28T11:20:38","guid":{"rendered":"https:\/\/www.tvm.co.mz\/novosite\/2018\/01\/28\/desequilibrio-atmosferico-pode-indicar-existencia-de-vida-diz-ciencia\/"},"modified":"2018-01-28T11:20:38","modified_gmt":"2018-01-28T11:20:38","slug":"desequilibrio-atmosferico-pode-indicar-existencia-de-vida-diz-ciencia","status":"publish","type":"post","link":"https:\/\/www.tvm.co.mz\/novosite\/2018\/01\/28\/desequilibrio-atmosferico-pode-indicar-existencia-de-vida-diz-ciencia\/","title":{"rendered":"&#8220;Desequil\u00edbrio atmosf\u00e9rico&#8221; pode indicar exist\u00eancia de vida, diz ci\u00eancia"},"content":{"rendered":"<p><img fetchpriority=\"high\" decoding=\"async\" class=\" size-full wp-image-13559\" src=\"https:\/\/www.tvm.co.mz\/novosite\/wp-content\/uploads\/2018\/01\/naom_5a003ea1cc2c9.jpg\" alt=\"naom_5a003ea1cc2c9.jpg\" width=\"1920\" height=\"1080\" srcset=\"https:\/\/www.tvm.co.mz\/novosite\/wp-content\/uploads\/2018\/01\/naom_5a003ea1cc2c9.jpg 1920w, https:\/\/www.tvm.co.mz\/novosite\/wp-content\/uploads\/2018\/01\/naom_5a003ea1cc2c9-300x169.jpg 300w, https:\/\/www.tvm.co.mz\/novosite\/wp-content\/uploads\/2018\/01\/naom_5a003ea1cc2c9-1024x576.jpg 1024w, https:\/\/www.tvm.co.mz\/novosite\/wp-content\/uploads\/2018\/01\/naom_5a003ea1cc2c9-768x432.jpg 768w, https:\/\/www.tvm.co.mz\/novosite\/wp-content\/uploads\/2018\/01\/naom_5a003ea1cc2c9-1536x864.jpg 1536w, https:\/\/www.tvm.co.mz\/novosite\/wp-content\/uploads\/2018\/01\/naom_5a003ea1cc2c9-1568x882.jpg 1568w\" sizes=\"(max-width: 1920px) 100vw, 1920px\" \/><\/p>\n<p><span style=\"font-size: 12pt;\">Cientistas defendem que um &#8220;desequil\u00edbrio atmosf\u00e9rico&#8221;, caracterizado pela mistura dos gases metano e di\u00f3xido de carbono na aus\u00eancia de mon\u00f3xido de carbono, \u00e9 um indicador da exist\u00eancia de vida, a ter em conta na explora\u00e7\u00e3o de outros planetas.<\/span><\/p>\n<p><span style=\"font-size: 12pt;\">Uma equipa de investigadores da Universidade de Washington, nos Estados Unidos, sustenta que s\u00f3 pode haver esta combina\u00e7\u00e3o de gases na presen\u00e7a de organismos vivos.<\/span><\/p>\n<p><span style=\"font-size: 12pt;\">No estudo, divulgado hoje na publica\u00e7\u00e3o cient\u00edfica Science Advances, a equipa salienta, passando em revista a hist\u00f3ria da Terra, o \u00fanico planeta habit\u00e1vel que se conhece, que houve alturas em que a sua atmosfera teve esta mistura de gases.<\/span><\/p>\n<p><span style=\"font-size: 12pt;\">Por outro lado, a capacidade de o planeta produzir grandes quantidades de oxig\u00e9nio, g\u00e1s constituinte da atmosfera e fundamental para suportar a vida, s\u00f3 ocorreu no \u00faltimo um oitavo da sua hist\u00f3ria.<\/span><\/p>\n<p><span style=\"font-size: 12pt;\">&#8220;A ideia de procurar oxig\u00e9nio na atmosfera enquanto bioassinatura [da vida] tem v\u00e1rios anos, e \u00e9 uma boa estrat\u00e9gia. \u00c9 muito dif\u00edcil produzir muito oxig\u00e9nio sem vida (&#8230;). Mas, mesmo se a vida for comum no cosmos, n\u00e3o temos ideia se ser\u00e1 a vida que produz oxig\u00e9nio. A bioqu\u00edmica da produ\u00e7\u00e3o de oxig\u00e9nio \u00e9 muito complexa e pode ser bastante rara&#8221;, advogou um dos coautores do estudo, Joshua Krissansen-Totton, citado em comunicado pela Universidade de Washington.<\/span><\/p>\n<p><span style=\"font-size: 12pt;\">Os autores do estudo entendem que a procura de sinais de vida em outros planetas deve ter em considera\u00e7\u00e3o o tal &#8220;desequil\u00edbrio atmosf\u00e9rico&#8221;, al\u00e9m da exist\u00eancia de \u00e1gua l\u00edquida \u00e0 superf\u00edcie.<\/span><\/p>\n<p><span style=\"font-size: 12pt;\">A nova miss\u00e3o europeia de explora\u00e7\u00e3o de Marte, a ExoMars, tem em \u00f3rbita do planeta o sat\u00e9lite TGO, que vai procurar gases rarefeitos na sua atmosfera, em particular metano, um indicador de que pode haver, ou ter havido, vida nele.<\/span><\/p>\n<p><span style=\"font-size: 12pt;\">Na Terra, o metano poder\u00e1 ter sido gerado pelo impacto de asteroides na sua superf\u00edcie, de acordo com a equipa de cientistas da Universidade de Washington.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<div class='heateorSssClear'><\/div><div  class='heateor_sss_sharing_container heateor_sss_horizontal_sharing' data-heateor-sss-href='https:\/\/www.tvm.co.mz\/novosite\/2018\/01\/28\/desequilibrio-atmosferico-pode-indicar-existencia-de-vida-diz-ciencia\/'><div class='heateor_sss_sharing_title' style=\"font-weight:bold\" >Partilhe<\/div><div class=\"heateor_sss_sharing_ul\"><a aria-label=\"Facebook\" class=\"heateor_sss_facebook\" href=\"https:\/\/www.facebook.com\/sharer\/sharer.php?u=https%3A%2F%2Fwww.tvm.co.mz%2Fnovosite%2F2018%2F01%2F28%2Fdesequilibrio-atmosferico-pode-indicar-existencia-de-vida-diz-ciencia%2F\" title=\"Facebook\" rel=\"nofollow noopener\" target=\"_blank\" style=\"font-size:32px!important;box-shadow:none;display:inline-block;vertical-align:middle\"><span class=\"heateor_sss_svg\" 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'%22Desequil%C3%ADbrio%20atmosf%C3%A9rico%22%20pode%20indicar%20exist%C3%AAncia%20de%20vida%2C%20diz%20ci%C3%AAncia', '' )\"><svg xmlns=\"http:\/\/www.w3.org\/2000\/svg\" xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" viewBox=\"-.3 0 32 32\" version=\"1.1\" width=\"100%\" height=\"100%\" style=\"display:block;border-radius:999px;\" xml:space=\"preserve\"><g><path fill=\"#fff\" d=\"M18 14V8h-4v6H8v4h6v6h4v-6h6v-4h-6z\" fill-rule=\"evenodd\"><\/path><\/g><\/svg><\/span><\/a><\/div><div class=\"heateorSssClear\"><\/div><\/div><div class='heateorSssClear'><\/div><br\/><p>Cientistas defendem que um &#8220;desequil\u00edbrio atmosf\u00e9rico&#8221;, caracterizado pela mistura dos gases metano e di\u00f3xido de carbono na aus\u00eancia de mon\u00f3xido de carbono, \u00e9 um indicador da exist\u00eancia de vida, a ter em conta na explora\u00e7\u00e3o de outros planetas. Uma equipa de investigadores da Universidade de Washington, nos Estados Unidos, sustenta que s\u00f3 pode haver esta combina\u00e7\u00e3o de gases na presen\u00e7a de organismos vivos. No estudo, divulgado hoje na publica\u00e7\u00e3o cient\u00edfica Science Advances, a equipa salienta, passando em revista a hist\u00f3ria da Terra, o \u00fanico planeta habit\u00e1vel que se conhece, que houve alturas em que a sua atmosfera teve esta mistura de gases. Por outro lado, a capacidade de o planeta produzir grandes quantidades de oxig\u00e9nio, g\u00e1s constituinte da atmosfera e fundamental para suportar a vida, s\u00f3 ocorreu no \u00faltimo um oitavo da sua hist\u00f3ria. &#8220;A ideia de procurar oxig\u00e9nio na atmosfera enquanto bioassinatura [da vida] tem v\u00e1rios anos, e \u00e9 uma boa estrat\u00e9gia. \u00c9 muito dif\u00edcil produzir muito oxig\u00e9nio sem vida (&#8230;). Mas, mesmo se a vida for comum no cosmos, n\u00e3o temos ideia se ser\u00e1 a vida que produz oxig\u00e9nio. A bioqu\u00edmica da produ\u00e7\u00e3o de oxig\u00e9nio \u00e9 muito complexa e pode ser bastante rara&#8221;, advogou um dos coautores do estudo, Joshua Krissansen-Totton, citado em comunicado pela Universidade de Washington. Os autores do estudo entendem que a procura de sinais de vida em outros planetas deve ter em considera\u00e7\u00e3o o tal &#8220;desequil\u00edbrio atmosf\u00e9rico&#8221;, al\u00e9m da exist\u00eancia de \u00e1gua l\u00edquida \u00e0 superf\u00edcie. A nova miss\u00e3o europeia de explora\u00e7\u00e3o de Marte, a ExoMars, tem em \u00f3rbita do planeta o sat\u00e9lite TGO, que vai procurar gases rarefeitos na sua atmosfera, em particular metano, um indicador de que pode haver, ou ter havido, vida nele. 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