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Raisin Bread Analogy for an Expanding Universe
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Description
Expanding universe
Hubble’s Law – the recessional speed of galaxies is proportional to their distance
Accounts for red shifts

Accounts for other galaxies moving away from us
Universe was once confined to a “ball” that was  
Supermassive
Dense
Hot

Matter is moving outward
Fate of the universe
Two possibilities
Universe will last forever
Outward expansion will stop and gravitational; contraction will follow

Fate of the universe
Final fate depends on the average density of the universe
If the density is more than the critical density, then the universe would contract
Current estimates point to less then the critical density and predict an ever-expanding, or open, universe
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