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OCR: easure them Knoun because we can hat the indirectly. So all we kno reen percent universe is expanding by d million vears. and 10 percent every the ut the present However our wncertaint eis even average density of the ses of all the greater. If we add up the alaxy and other stars that we can see in one hundredth galaxies, the total is less the expansion of the amount required owest estimate of the universe even for galaxy and ofthe rate of expansion. contain other galaxies however that we large amount of dark m we know must cannot see directly. but nce ofits be there because of the orbits of stars gravitational attraction ost galaxies in the galaxies. Moreov Te found known wniverse years everT wncertain laxy Moreoy