الصوت الساكن
Leo Capetinne
O universo observável é uma região em forma esférica do Universo que compreende toda a matéria que pode ser observada da Terra ou de seus telescópios espaciais e sondas exploratórias na atualidade, porque a radiação eletromagnética desses objetos teve tempo de chegar ao Sistema Solar e à Terra desde o início da expansão cosmológica. Pode haver 2 trilhões de galáxias no universo observável, embora esse número tenha sido estimado recentemente em apenas várias centenas de bilhões
تابع
30
2
12
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