An expanding universe implies some physical characteristics:
1. The bulk of atoms are made up of electrons moving about protons and neutrons ("Matter")
2. Gravity is attractive (Matter clumps together)
3. Time moves only forward
4. Red Shift is apparent when measuring large distances
5. Entropy (disorder) increases
6. Enthalpy (energy content) decreases
So in this universe, to use a classic example, in dropping a teacup gravity causes it to move towards Earth and smash to pieces (increase entropy) while time moves forward. In space, large clumps of matter (galaxies) are accelerting away from us (Red Shift) and energy content decreases, as the stars burn their nuclear fuel.
In contrast, a contracting universe is one where:
1. The bulk of atoms are made up of positrons moving about antiprotons and antineutrons ("AntiMatter")
2. Gravity is repulsive (Matter spreads out)
3. Time moves only backward
4. Blue Shift is apparent when measuring large distances
5. Entropy (disorder) decreases
6. Enthalpy (energy content) increases
In this universe, broken china shards on the floor reassemble into a teacup (decrease entropy) while moving away from Earth (Antigravity) while time moves backward. In space, Antimatter galaxies accelerate towards us (Blue Shift) dispersing into atoms, and energy content increases as uniform clouds of gas in this contracting universe are squeezed together.
"A Brief History of Time," Stephen Hawking, 1990
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