ESSENTIAL COSMIC PERS.-W/MASTER.ACCESS
ESSENTIAL COSMIC PERS.-W/MASTER.ACCESS
9th Edition
ISBN: 9780135795750
Author: Bennett
Publisher: PEARSON
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Concept explainers

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Chapter 17, Problem 38EAP
To determine

To Explain: A hypothesis for the darkness of the night sky that would have been plausible in Kepler’s time but does not depend on the Big Bang theory.

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Using our example from the previous unit, let's try to determine the Hubble time for this example universe. You were given that a good representative galaxy receded at a speed of 4000 km/s and was found to be 20 Mpc away. With that in mind, what would the age of that universe be in years (aka what is that universe's Hubble time)? Go ahead and take the number of kilometers per Mpc to be approximately 3.1*10^19 km/Mpc. While this problem may look scary at first, this is really just bringing you full circle to one of the unit conversion problems you encountered at the beginning of this course.
Onset of Cosmic Reionization: Evidence of an Ionized Bubble Merely 680 Myr aer the Big Bang.V. Tilvi et al 2020 ApJL 891 L10. Link: https://iopscience.iop.org/article/10.3847/2041-8213/ab75ecAnswer the following questions related to this article:(a) What is the so called cosmic reionization process?(b) What are Lyα lines and why did the researches want to observe them?(c) What do the authors intend to point out with Figure 1 (see article)?(d) How is confirmed that the peaks seen in Figure 3 are actually from Lyα emissions?(e) How are the bubble sizes of the galaxies estimated?(f) What is special about the findings in the article and what are the scientific implications?
The matter density in the Universe today is Pm = -27 kg m-3. What would 2.7 x 10 be the value of the density parameter, 2o, if the Hubble constant had the value Ho = 38 km/s/Mpc? Assume the Universe does not contain dark energy and choose the option below that best matches your answer. Select one: O a. 0.1 O b. 2. О с. 1. O d. 0.7 О е. 0.5
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