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Uma nebulosa é uma nuvem de gás e poeira cósmica que se encontra no espaço. Pode ser formada por explosões de estrelas moribundas ou por regiões onde # novas estrelas estão a nascer.  Características  Podem ter dezenas ou centenas de anos-luz de diâmetro São formadas por poeira espacial, plasma e hidrogênio Podem ser de emissão, reflexão, escuras ou planetárias Importância São fundamentais para a compreensão da formação e evolução estelar  São importantes para a compreensão da química .
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ao demonstrar que a água já poderia estar presente no universo apenas algumas centenas de milhões de anos após o Big Bang, lança-se luz sobre as condições iniciais que poderiam ter favorecido a formação de vida em outros locais do cosmos. As supernovas da População III, ao enriquecerem o meio interestelar com água e outros elementos pesados, teriam preparado o palco para a complexidade química necessária à origem biológica, sugerindo que a água não é apenas um subproduto da evolução estelar.
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