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ESSENTIAL COSMIC PERS.-W/MASTER.ACCESS
9th Edition
ISBN: 9780135795750
Author: Bennett
Publisher: PEARSON
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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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Students have asked these similar questions
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
Chapter 17 Solutions
ESSENTIAL COSMIC PERS.-W/MASTER.ACCESS
Ch. 17 - Prob. 1VSCCh. 17 - Prob. 2VSCCh. 17 - Prob. 3VSCCh. 17 - Prob. 1EAPCh. 17 - 2. What is antimatter? How were...Ch. 17 - Prob. 3EAPCh. 17 - Prob. 4EAPCh. 17 - Prob. 5EAPCh. 17 - Prob. 6EAPCh. 17 - Prob. 7EAP
Ch. 17 - Prob. 8EAPCh. 17 - Prob. 9EAPCh. 17 - Prob. 10EAPCh. 17 - Prob. 11EAPCh. 17 - Prob. 12EAPCh. 17 - Describe three key questions about the universe...Ch. 17 - Prob. 14EAPCh. 17 - Prob. 15EAPCh. 17 - Prob. 16EAPCh. 17 - Prob. 17EAPCh. 17 - Prob. 18EAPCh. 17 - Prob. 19EAPCh. 17 - Prob. 20EAPCh. 17 - Prob. 21EAPCh. 17 - Prob. 22EAPCh. 17 - Prob. 23EAPCh. 17 - Prob. 24EAPCh. 17 - Prob. 25EAPCh. 17 - Prob. 26EAPCh. 17 - Prob. 27EAPCh. 17 - Prob. 28EAPCh. 17 - Prob. 29EAPCh. 17 - Prob. 30EAPCh. 17 - Prob. 31EAPCh. 17 - Prob. 32EAPCh. 17 - Prob. 33EAPCh. 17 - Prob. 34EAPCh. 17 - Prob. 35EAPCh. 17 - Unanswered Questions. Briefly describe one...Ch. 17 - Prob. 38EAPCh. 17 - Prob. 39EAPCh. 17 - Prob. 40EAPCh. 17 - Prob. 41EAPCh. 17 - Prob. 42EAPCh. 17 - Re-creating the Big Bang. Particle accelerators on...Ch. 17 - Prob. 44EAPCh. 17 - Prob. 45EAPCh. 17 - Prob. 46EAPCh. 17 - Prob. 47EAPCh. 17 - Prob. 48EAPCh. 17 - Prob. 49EAPCh. 17 - Uniformity of the Cosmic Microwave Background. The...Ch. 17 - Prob. 51EAP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- It is possible to derive the age of the universe given the value of the Hubble constant and the distance to a galaxy, again with the assumption that the value of the Hubble constant has not changed since the Big Bang. Consider a galaxy at a distance of 400 million light-years receding from us at a velocity, v. If the Hubble constant is 20 km/s per million light-years, what is its velocity? How long ago was that galaxy right next door to our own Galaxy if it has always been receding at its present rate? Express your answer in years. Since the universe began when all galaxies were very close together, this number is a rough estimate for the age of the universe.arrow_forwardWhat does the term Hubble time mean in cosmology, and what is the current best calculation for the Hubble time?arrow_forwardWhy cant an open universe have a center? How can a closed universe not have a center?arrow_forward
- There is still some uncertainty in the Hubble constant. (a) Current estimates range from about 19.9 km/s per million light-years to 23 km/s per million light-years. Assume that the Hubble constant has been constant since the Big Bang. What is the possible range in the ages of the universe? Use the equation in the text, T0=1H , and make sure you use consistent units. (b) Twenty years ago, estimates for the Hubble constant ranged from 50 to 100 km/s per Mps. What are the possible ages for the universe from those values? Can you rule out some of these possibilities on the basis of other evidence?arrow_forwardWhich of the following is least reasonable regarding cosmic background radiation (CBR)? Group of answer choices CBR correponds to a solar temperature of about 6,000 degrees and implies that the Universe was about 3K right after the Big Bang. The original CBR corresponded to a much higher temperature, but the expansion of the Universe has caused to be strongly Doppler-shifted toward longer wavelengths. Satellite-based telescopes were crucial to the discovery of CBR because much of the CBR spectrum cannot be detected through our atmosphere. The motion of the Earth produces a Doppler shift, which causes CBR to appear a little hotter in front of us and a little colder behind us. Data for CBR is collected by pointing telescopes to regions that do not appear to have any bright objects.arrow_forwardI'm doing a debate about Kalam cosmological. I need to have an example of something out of nothing (Or maybe we can't prove the cause)? Can you help give 5 modern physics example?arrow_forward
- Was the Big Bang an explosion? Explain your answer.arrow_forwardWith the aid of a diagram, explain the physical origin of cosmological redshift in an expanding universe, and how this differs from the Doppler shift due to relative motion. Observations of distantgalaxies indicate that their recession velocities, v, and their distances, d, follow a Hubble Law:v = H0d, where H0 is a constant. Using the analogy of an expanding grid or ruler, demonstratethat Hubble’s Law indicates that the Universe is undergoing uniform expansion.arrow_forwardWhich of decoupling and nucleosynthesis do you feel is the stronger test of the Hot Big Bang cosmology, and why?arrow_forward
- Assume the observable Universe is charge neutral, and that it contains n nuclei (hydrogen plus helium nuclei, ignoring other elements). Take the helium mass fraction as 1/4. How many electrons are there in the observable Universe? Enter your answer in scientific notation with one decimal place. Values: n = 1*10^80arrow_forwardExplain the big bang theory.arrow_forwardThe Andromeda Galaxy, M31, is the closest large spiral Galaxy to our Milky Way. When we lookat its chemical spectrum, we see that it's hydrogen alpha emission line has an observed wavelength of 655nm. a. Calculate z, being careful with the sign b. How fast is it moving in km/s c. Is it redshifted or blueshifted? Is it moving toward or away from us?arrow_forward
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