Page 26 - A Brief History of Time - Stephen Hawking

A Brief History of Time - Stephen Hawking... Chapter 3

Figure 3:2

Figure 3:2 shows how the distance between two neighboring galaxies changes as time increases. It starts at
zero, increases to a maximum, and then decreases to zero again. In the second kind of solution, the universe is
expanding so rapidly that the gravitational attraction can never stop it, though it does slow it down a bit.

Figure 3:3

Figure 3:3 Shows the Separation between neighboring galaxies in this model. It starts at zero and eventually
the galaxies are moving apart at a steady speed. Finally, there is a third kind of solution, in which the universe
is expanding only just fast enough to avoid recollapse.

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