Estudo indica que Via Láctea tem bilhões de planetas supostamente habitáveis
Autor: FabianoLourenzo | Publicado: 2012-03-29T15:50:00-07:00

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Cerca de 40% das estrelas
anãs-vermelhas têm uma "Super-Terra" na órbita



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Uma
equipe internacional de astrônomos descobriu que a galáxia onde fica a Terra, a
Via Láctea, abriga dezenas de bilhões de planetas rochosos que giram em torno
de anãs vermelhas - estrelas cuja massa é menor que a do Sol. O estudo,
realizado pelo Observatório Europeu do Sul (ESO, na sigla em inglês) e
divulgado nesta quarta-feira, contou com dados obtidos pelo espectrógrafo
Harps, o "caçador de planetas" instalado em um telescópio de 3,6
metros do observatório La Silla, no Chile.

Segundo
a pesquisa, é possível deduzir que nas vizinhanças do Sistema Solar, a
distâncias inferiores a 30 anos luz, pode haver uma centena de
"Super-Terras" (planetas com massa de uma a dez vezes superior à da
Terra). Esta foi a primeira vez que foi medida de forma direta a frequência de
Super-Terras em torno de anãs-vermelhas, que representam 80% das estrelas de
nossa galáxia.

"Cerca de 40% de todas as
estrelas anãs-vermelhas têm uma Super-Terra orbitando em sua zona de
habitabilidade, uma região que permite a existência de água líquida sobre a
superfície do planeta", explicou o líder da equipe internacional, Xavier
Bonfils.