NASA    descobre planeta do tamanho da Terra
Autor: O OBSERVADOR | Publicado: 2014-04-19T12:00:00-07:00

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NASA descobre planeta do
tamanho da Terra onde existe chance de haver vida

&nbsp;



Cientistas acreditam na possibilidade de haver vida, pois o
Kepler-186f apresenta condições muito semelhantes às de nosso planeta

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Através do telescópio espacial Kepler, a NASA já foi capaz de identificar alguns planetas possivelmente habitáveis.
Mas eventualmente havia uma característica ou outra que poderia diminuir as
chances de encontrarmos vida fora da Terra. Porém, ontem (17) a agência
espacial divulgou a notícia de que o telescópio encontrou um planeta muito
semelhante à Terra.


A NASA revelou que o Kepler-186f é o primeiro planeta confirmado a ter o
tamanho da Terra e estar localizado na zona habitável de outra estrela. Isso
significa que o novo astro tem o tamanho ideal e a distância certa de seu sol
para que ele possa apresentar características similares às de nosso planeta –
ou seja, uma composição rochosa e água em estado líquido na superfície.



Um primo da Terra
Essa descoberta é resultado da análise de dados que foram coletados pelo
Kepler entre março de 2009 e maio de 2013. Nesse período, os outros planetas descobertos
eram muito grandes (o que seria um indício de sua composição gasosa) ou estavam
perto ou longe demais da estrela mais próxima (o que dificultaria a existência
de água na superfície).


Ainda, os planetas anteriormente encontrados em
zonas habitáveis eram 40% maiores do que a Terra. Por outro lado, o Kepler-186f
tem uma diferença de apenas 10% com o nosso planeta. Além disso, os cientistas
já sabem que o astro leva 130 dias para completar a órbita em torno de sua
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Os pesquisadores também observaram que o Kepler-186f orbita uma estrela
anã-vermelha, que é menor, mais fria e menos brilhante do que o sol. Ainda,
sabe-se que o novo planeta – que, por causa das diferenças, está sendo
considerado mais um primo do que um irmão gêmeo da Terra – está a 500 anos-luz
de distância.



Novas investigações
“Estar na zona habitável não significa que o planeta é habitável. A
temperatura no planeta depende muito do tipo de atmosfera que ele tem”, explica
Thomas Barclay, pesquisador do Bay Area Environmental Research Institute.


Contudo, a atmosfera do Kepler-186f ainda é desconhecida. O telescópio
espacial não possui tecnologia suficiente para detectar se as condições
atmosféricas são ideais para a presença de água e para que as temperaturas
sejam toleráveis para haver vida da maneira que conhecemos. Uma análise mais
detalhada do astro será feita pelo telescópio espacial James Webb, que deve ser
colocado em órbita em 2018.


“A revelação do Kepler-186f é um passo significante em direção à descoberta
de outros planetas como a Terra. Futuras missões da NASA (...) descobrirão os
exoplanetas rochosos mais próximos e determinarão sua composição e as condições
atmosféricas, dando continuidade à busca da humanidade por outros mundos como a
Terra”, comenta Paul Hertz, diretor da divisão de astrofísica da sede da NASA
em Washigton.
Quem viver,se for mesmo verdade..vera..até la...