A galáxia irregular NGC 4485 mostra todos os sinais de ter estado envolvido em um acidente de atropelamento e fuga com uma galáxia de contorno. Em vez de destruir a galáxia, o encontro casual está gerando uma nova geração de estrelas e presumivelmente planetas.
O lado direito da galáxia está em chamas com a formação de estrelas, mostrada na pletora de jovens estrelas azuis e nebulosas incubadoras de estrelas. O lado esquerdo, no entanto, parece intacto. Contém dicas da estrutura espiral anterior da galáxia, que, ao mesmo tempo, estava passando por uma evolução galáctica normal.
A galáxia culpada maior, NGC 4490, está fora do fundo do quadro. As duas galáxias se enfrentaram há milhões de anos e estão agora a 24.000 anos-luz de distância. O cabo-de-guerra gravitacional entre eles criou ondulações de gás e poeira de alta densidade dentro de ambas as galáxias. Esta atividade provocou uma onda de formação de estrelas.
Esta galáxia é um exemplo próximo do tipo de atividade cósmica de pára-choque que era mais comum há bilhões de anos, quando o universo era menor e as galáxias estavam mais próximas.
NGC 4485 fica a 25 milhões de anos-luz de distância na constelação do norte Canes Venatici (os cães de caça).
Esta nova imagem, capturada pela Wide Field Camera 3 do Hubble (WFC3), fornece uma visão adicional das complexidades da evolução da galáxia.
O Telescópio Espacial Hubble é um projeto de cooperação internacional entre a NASA e a ESA (Agência Espacial Européia). O Centro de Voos Espaciais Goddard, da NASA, em Greenbelt, Maryland, administra o telescópio. O Instituto de Ciência do Telescópio Espacial (STScI) em Baltimore, Maryland, conduz operações científicas do Hubble. O STScI é operado pela NASA pela Associação de Universidades de Pesquisa em Astronomia, em Washington, D.C.
Crédito de texto: Instituto de Ciência do Telescópio Espacial
Crédito da imagem: NASA, ESA;
Conyrcimen: T. Roberts (Universidade de Durham, Reino Unido), D. Calzetti (Universidade de Massachusetts) e a Equipe de LEGUS, R. Tully (Universidade do Havaí) e R. Chandar (Universidade de Toledo)
Telescópio Espacial Hubble
(NASA)
Texto: Júlia Machado
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