Nasa confirmar a existência do primeiro planeta habitável numa região fora do sistema solar.
Autor: Moderação | Publicado: 2011-12-05T18:04:00-03:00

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No início deste ano, cientistas franceses confirmaram a existência do primeiro planeta fora do sistema solar a atender às exigências para a manutenção da vida, conhecido como Gliese 581d, mas o Kepler 22b, visto pela primeira vez em 2009, foi o primeiro cujas características puderam ser confirmadas pela agência espacial norte-americana.  A confirmação significa que os astrônomos viram o planeta cruzar a frente de sua estrela três vezes. "A fortuna sorriu para nós com a detecção do primeiro planeta", disse William Borucki, principal pesquisador do Kepler no Centro de Pesquisas Ames, da Nasa. "O primeiro trânsito foi capturado apenas três dias depois de termos declarado o telescópio pronto operacionalmente. Nós testemunhamos a definição do terceiro trânsito durante o período de férias de 2010."O Kepler-22b está há 600 anos-luz de distância e é maior do que a Terra. O planeta tem uma órbita de 290 dias ao redor de sua estrela. A Nasa também anunciou que o Kepler descobriu mais de 1.000 planetas com potencial de abrigar vida, duas vezes o número previamente localizado, segundo uma pesquisa que está sendo apresentada numa conferência realizada na Califórnia nesta semana. O Kepler é a primeira sonda espacial da Nasa que procurar planetas semelhantes à Terra que orbitem sóis similares aos nossos. As informações são da Dow Jones.
Fonte: Site Yahoo.