SORU: paragrafta boş bırakılan yere uygun düşen cümleyi bulunuz
One of the dominating astronomical discoveries of the 20th century was the realisation that the galaxies of the universe all seem to be moving away from us. ……….. . In other words, the universe seems to be expanding. Hence, scientists conclude that the universe must once, very long ago, have been extremely compact and dense.