We can look at ranges of q for the three cases of k:

We can easily show (see Problem 20.8) that H = 2q. If H = 70 km/s/Mpc, then pcrit is u o o «

Oscillating universe. In this picture t0 is the current time.The universe is the single cycle that contains t0. If the universe is oscillating, then, after all the material comes back together, the expansion starts again.

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