21st Century Astronomy
21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 22, Problem 16QP
To determine

Circumstances would cause an expanding universe to reverse its expansion and result in Big crunch.

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The background radiation has an average temperature of 2.7 K, using Wien’s Law, the current background radiation in the microwave region, the peak wavelength is 1mm. In the past, when the cosmic background radiation had a peak wavelength of 51.1 µm, calculate the relative size of the universe compared to the current size of the universe, that is, the universe was how much smaller by a factor of what? Round to TWO places past the decimal
What evidence can you cite that the expansion of the universe is accelerating?
What was the typical density of the universe, when the microwave background radiation was last scattered (redshift around 1000)? Enter your answer in kilograms per cubic metres.
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