OpenStudy (josedavid):
One student made a science model with a balloon having many spots on it. The balloon was blown up gradually as shown below. What is best demonstrated by this model? galaxies move closer when the universe expands density of particles in space decreases when the universe expands gravitational force determines the distribution of matter in the universe gravitational force on galaxies decreases when the universe espands
OpenStudy (josedavid):
OpenStudy (josedavid):
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OpenStudy (anonymous):
density of particles in space decreases when universe expands. Or more precisely, density=initial density/A(t)^3, where A(t)=scale factor of universe
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