21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 23, Problem 4QP
To determine
The following characteristics that does not differentiate the cold and hot dark matter.
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1. Which of these is true about the Big Bang model?
a. The singularity is an established, well-defined part of the model.
b. Cosmic expansion stopped at some point in time.
c. Part of its proof is the amounts of H and He we have in the universe today.
d. The Big Bang was a big explosion that threw matter into many different directions
What is dark matter? (200 words)
5. Cesar reads about the big bang theory, which explains that the universe expanded as theresult of an explosion. He wants to evaluate whether this theory is a good one. Whichstatement is a characteristic of a good theory?
A. It is the idea of only one scientist.B. It does not change as time passes.C. It is not supported by scientific evidence.D. It changes with new observations made by astronomers.
Chapter 23 Solutions
21st Century Astronomy
Ch. 23.1 - Prob. 23.1CYUCh. 23.2 - Prob. 23.2CYUCh. 23.3 - Prob. 23.3CYUCh. 23.4 - Prob. 23.4CYUCh. 23 - Prob. 1QPCh. 23 - Prob. 2QPCh. 23 - Prob. 3QPCh. 23 - Prob. 4QPCh. 23 - Prob. 5QPCh. 23 - Prob. 6QP
Ch. 23 - Prob. 7QPCh. 23 - Prob. 8QPCh. 23 - Prob. 9QPCh. 23 - Prob. 10QPCh. 23 - Prob. 11QPCh. 23 - Prob. 12QPCh. 23 - Prob. 13QPCh. 23 - Prob. 14QPCh. 23 - Prob. 15QPCh. 23 - Prob. 16QPCh. 23 - Prob. 17QPCh. 23 - Prob. 18QPCh. 23 - Prob. 19QPCh. 23 - Prob. 20QPCh. 23 - Prob. 21QPCh. 23 - Prob. 22QPCh. 23 - Prob. 23QPCh. 23 - Prob. 24QPCh. 23 - Prob. 25QPCh. 23 - Prob. 26QPCh. 23 - Prob. 27QPCh. 23 - Prob. 28QPCh. 23 - Prob. 29QPCh. 23 - Prob. 30QPCh. 23 - Prob. 31QPCh. 23 - Prob. 32QPCh. 23 - Prob. 33QPCh. 23 - Prob. 36QPCh. 23 - Prob. 37QPCh. 23 - Prob. 38QPCh. 23 - Prob. 45QP
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- Dark Matter and Closure• Discuss the existence of dark matter.• Explain neutrino oscillations and their consequences.arrow_forward10. In most models for the early universe, which was the first force to have frozen out of the original Supersymmetric force? a. Weak Nuclear Force. b. Strong Nuclear Force. c. Gravity. d. Electromagnetism.arrow_forward1. What is formed when there is a fusion of two deuterium nuclei in big bang nucleosynthesis? 2. What are the conditions in the universe so that a nuclear fusion could occur? 3. What is formed when there is fusion of deuterium and tritium? 4. What was formed as the universe expanded and cooled down?arrow_forward
- Describe the Big Bang Theory. Include A) what it is, B)what happened , and C) at least three lines of evidence to support it.arrow_forwardExplain the big bang theory.arrow_forwardWhat possible evidence do we have for the existence of "dark energy"? a. It blocks our view of distant parts of the universe b. The universe contains more light than has ever been emitted by stars. c. Expansion seems to be accelerating d. We see the cosmic background radiation in all directions e. All of the abovearrow_forward
- Einstein said that gravity exists because: * A. massive objects warp space. B. of the existence of black holes. C. massive objects attract one another. D. light moves randomly throughout the universe. How do scientists / astronomers spot a black hole? * A. by using gamma rays and x-rays to detect high energy sources B. by using radioactive waves to detect high energy sources C. By using high energy to detect gamma rays and x-rays D. By using massive telescopes to detect gamma ray If you place your index just in front of you and try to look at it with you right eye open and your left eye close, then look at it with your left eye open and right eye close this time. You will notice that there is a slight change of the position of your index finger. What concept is applied how astronomers were able to measure the distance of heavenly bodies from the Earth? * A. Cosmic distance ladder B. Parallax C. Luminosity…arrow_forwardWhat is dark matter and how do we know it exists?arrow_forward(Astronomy) Orbital Period. What is the orbital period of a bit of matter in an accretion disk 1×105 km from a 11-solar-mass black hole? (Hint: Use the circular orbit velocity.) Express your answer in seconds.arrow_forward
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