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O efeito Doppler de galáxias distantes é uma consequência da expansão do universo. Ele ocorre porque a luz emitida por essas galáxias é deslocada para o vermelho à medida que se afasta de nós. Isso acontece devido ao alongamento das ondas de luz à medida que o espaço entre nós e a galáxia se expande. Esse deslocamento para o vermelho é chamado de desvio para o vermelho cosmológico e é usado para determinar a velocidade com que as galáxias se afastam de nós, fornecendo evidências da expansão do u
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