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O diagrama de Hubble foi criada em 1929, a partir da análise das velocidades radiais de galáxias, medidas pelo Slipher Vesto a partir de redshifts de linhas espectrais. Ela representa a velocidade de galáxias de acordo com a distância, ou em outras palavras, mais uma galáxia é longe de nós, mais parece se afastar rapidamente. É a partir deste estudo que o conceito de expansão do universo aparece. #física #astrofísica #matematica #estudantes
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Redshift é uma ferramenta fundamental para medir o universo. Como os astronomos geralmente conseguem determinar qual comprimento de onda veriam de perto, eles podem dizer a que distância uma galáxia está pela quantidade de variação da luz. Galáxias distantes têm toda a sua luz visível deslocada para infravermelho. #astronomy
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