Cientistas identificam gás que indica possibilidade de vida em Vênus

Gás é altamente tóxico e fonte dele no planeta ainda não foi descoberta NASA/JPL-Caltech/Handout

Cientistas dos Estados Unidos, Reino Unido e Japão anunciaram nesta segunda-feira (14), a descoberta da presença do gás de fosfina na atmosfera de Vênus, o planeta mais próximo da Terra. A presença desse composto é considerada um indício de que possa existir vida naquele local, mas os pesquisadores apontam a necessidade de estudos mais aprofundados.

A fosfina é um gás altamente tóxico, composto por hidreto de fósforo e raro de ser encontrado em seu estado natural na Terra, sendo utilizado principalmente em inseticidas. A fonte da substância em Vênus ainda não foi descoberta, mesmo após análises exaustivas na atmosfera, após investigação de nuvens, superfície e subsuperfície do planeta ou pelo estudo de possíveis transferências por vulcões, relâmpagos e meteoros.

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Apesar de letal, a fosfina foi encontrada em uma quantidade impossível de ser criada por processos abióticos, indicando que sua presença no planeta pode estar ligada a organismos vivos.

Além das nuvens de ácido sulfúrico e uma temperatura tão alta que beira os 462,2ºC, o planeta tem uma atmosfera composta de 96% de dióxido de carbono e pressão de superfície 92 vezes maior que a da Terra. A descoberta foi feita usando o telescópio James Clerk Maxwell, no Havaí, e o telescópio Atacama, no Chile, por uma equipe de cientistas da Universidade de Manchester, Cardiff e do Instituto de Tecnologia de Massachusetts - além da participação da Universidade de Kyoto.

LEIA TAMBÉM: Veja imagens do retorno dos astronautas da Nasa à Terra

Este texto foi publicado primeiro em http://noticias.r7.com/tecnologia-e-ciencia/cientistas-identificam-gas-que-indica-possibilidade-de-vida-em-venus-14092020

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