UNDERSTANDING THE UNIVERSE(LL)-W/CODE
3rd Edition
ISBN: 9780393869903
Author: PALEN
Publisher: NORTON
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Chapter 15, Problem
To determine
The dark matter was detected due to which of the given reasons.
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What is the strongest piece of evidence for the existence of dark matter?
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Distribution of Dark matter
The most mass of our Milky Way is contained in an inner region close to the core with radius R0.Because the mass outside this inner region is almost constant, the density distribution can bewritten as following (assume a flat Milky Way with height z0):ρ(r) = (ρ0, r ≤ R00, r > R0(a) Derive an expression for the mass M(r) enclosed within the radius r.(b) Derive the expected rotational velocity of the Milky Way v(r) at a radius r.
Which of the following statements about the different types (shapes) of galaxies are correct? (choose all that apply)
whatever type a galaxy is at its birth, that’s what it will be for all time
what type we see a galaxy to be just depends on the angle at which we happen to see it; all galaxies look roughly the same in shape
all galaxies start out as ellipticals, but some later evolve to be spirals and irregulars
collisions and mergers between galaxies can sometimes change a galaxy’s type (shape)
Chapter 15 Solutions
UNDERSTANDING THE UNIVERSE(LL)-W/CODE
Ch. 15.1 - Prob. 15.1CYUCh. 15.2 - Prob. 15.2CYUCh. 15.3 - Prob. 15.3CYUCh. 15.4 - Prob. 15.4CYUCh. 15 - Prob. 1QAPCh. 15 - Prob. 2QAPCh. 15 - Prob. 3QAPCh. 15 - Prob. 4QAPCh. 15 - Prob. 5QAPCh. 15 - Prob. 6QAP
Ch. 15 - Prob. 7QAPCh. 15 - Prob. 8QAPCh. 15 - Prob. 9QAPCh. 15 - Prob. 10QAPCh. 15 - Prob. 11QAPCh. 15 - Prob. 12QAPCh. 15 - Prob. 13QAPCh. 15 - Prob. 14QAPCh. 15 - Prob. 15QAPCh. 15 - Prob. 16QAPCh. 15 - Prob. 17QAPCh. 15 - Prob. 18QAPCh. 15 - Prob. 19QAPCh. 15 - Prob. 20QAPCh. 15 - Prob. 21QAPCh. 15 - Prob. 22QAPCh. 15 - Prob. 23QAPCh. 15 - Prob. 24QAPCh. 15 - Prob. 25QAPCh. 15 - Prob. 26QAPCh. 15 - Prob. 27QAPCh. 15 - Prob. 28QAPCh. 15 - Prob. 29QAPCh. 15 - Prob. 30QAPCh. 15 - Prob. 31QAPCh. 15 - Prob. 32QAPCh. 15 - Prob. 33QAPCh. 15 - Prob. 34QAPCh. 15 - Prob. 35QAPCh. 15 - Prob. 36QAPCh. 15 - Prob. 37QAPCh. 15 - Prob. 38QAPCh. 15 - Prob. 39QAPCh. 15 - Prob. 40QAPCh. 15 - Prob. 41QAPCh. 15 - Prob. 42QAPCh. 15 - Prob. 43QAPCh. 15 - Prob. 44QAPCh. 15 - Prob. 45QAP
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- A stellar black hole may form when a massive star dies. The mass of the star collapses down to a single point. Imagine an astronaut orbiting a black hole having eight times the mass of the Sun. Assume the orbit is circular. a. Find the speed of the astronaut if his orbital radius is r = 1 AU. b. Find his speed if his orbital radius is r = 11.8 km. c. CHECK and THINK: Compare your answers to the speed of light in a vacuum. What would the astronauts orbital speed be if his orbital radius were smaller than 11.8 km?arrow_forwardDescribe at least two characteristics of the universe that are explained by the standard Big Bang model.arrow_forwardStarting with the determination of the size of Earth, outline a sequence of steps necessary to obtain the distance to a remote cluster of galaxies. (Hint: Review the chapter on Celestial Distances.)arrow_forward
- A galaxy is found to be receding at a velocity of 3.0 x 104 km-s-1. Calculate the distance to the galaxy.arrow_forward5) The recessional velocity of a galaxy is found to be 0.52c. Calculate the redshift. (2arrow_forwardBased on Figure 1 below, which galaxies are moving away from us the fastest? Velocity (km/sec) 2000 1500 1000 500 0 -500 0 Those that are ~ 20 Mpcs away Those that are ~ 15 Mpcs away Those that are ~ 10 Mpcs away Those that are ~ 1 Mpcs away 20 Distance (Mpc) 10 30arrow_forward
- Galaxy seeds around which galaxies, clusters, and walls grew may have been a. caused by hot dark matter. b. caused by baryons. c. the result of the separation of the electromagnetic and weak forces. d. the result of freezing water molecules shortly after the universe became transparent to photons. e. caused by microscopic random fluctuations in the infant universe.arrow_forwardThe cosmic microwave background consists of: huge clouds of dark matter interspersed with equally huge clouds of H and He enormous cold voids separating warmer filaments of young protostas and protogalaxies denser areas of slightly warmer Hydrogen mixed with slightly less dense areas of slightly cooler Helium an enormous number of photons, particles of light that emerged after the Big Bang atoms of H and He, dark matter, and an immense amount of energy MacBook Air DII DD 30 D00 000 F7 F8 F9 F4 F5 F6 & 4 8 R Yarrow_forwardAll Radio Galaxies have the following number of plasma jets and lobes a) 2 b) 5 c) 1 d) 4 e)7arrow_forward
- Hubble's Law Constant provides the following information about the observable universe: galaxies within the universe are moving away it is expanding it is 13.8 billion years old it is 13.8 million light-years in diameterarrow_forwardPretend that galaxies are spaced evenly, 7.0 Mpc apart, and the average mass of a galaxy is 1.0 ✕ 1011 M. What is the average density (in kg/m3) of matter in the universe? (Note: The volume of a sphere is 4/3pieR^3 and the mass of the sun is 2.0 ✕ 1030 kg.) ______ kg/m^3 Which model universe does this density value support? A: open B: flat C: closedarrow_forward___________ are generally expected to be found at the center of most galaxies. If large amounts of material are accreted onto them, an AGN (active galactic nucleus) can result, causing large jets of gas, dust, and high energy photons.arrow_forward
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