- #1
photonkid
- 35
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I've read that until 5 billion years ago the rate of expansion of space was decreasing. How do we know that it was slowing down?
Does the uniformity of the CMB mean that the rate of expansion is identical throughout the entire universe - or does it just mean that the average rate of expansion over a sufficiently large amount of space is identical?
If the density of matter is the reason for the change in the rate of expansion then why isn't the rate of expansion different at different places in the universe?
Does the uniformity of the CMB mean that the rate of expansion is identical throughout the entire universe - or does it just mean that the average rate of expansion over a sufficiently large amount of space is identical?
If the density of matter is the reason for the change in the rate of expansion then why isn't the rate of expansion different at different places in the universe?