Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Chapter 29, Problem 7E
Why do astronomers believe there must be dark matter that is not in the form of atoms with protons and neutrons?
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Chapter 29 Solutions
Astronomy
Ch. 29 - What are the basic observations about the universe...Ch. 29 - Describe some possible futures for the universe...Ch. 29 - What does the term Hubble time mean in cosmology,...Ch. 29 - Which formed first: hydrogen nuclei or hydrogen...Ch. 29 - Describe at least two characteristics of the...Ch. 29 - Describe two properties of the universe that are...Ch. 29 - Why do astronomers believe there must be dark...Ch. 29 - What is dark energy and what evidence do...Ch. 29 - Thinking about the ideas of space and time in...Ch. 29 - Astronomers have found that there is more helium...
Ch. 29 - Describe the anthropic principle. What are some...Ch. 29 - Describe the evidence that the expansion of the...Ch. 29 - What is the most useful probe of the early...Ch. 29 - What are the advantages and disadvantages of using...Ch. 29 - Would acceleration of the universe occur if it...Ch. 29 - Suppose the universe expands forever. Describe...Ch. 29 - Some theorists expected that observations would...Ch. 29 - There are a variety of ways of estimating the ages...Ch. 29 - Since the time of Copernicus, each revolution in...Ch. 29 - The anthropic principle suggests that in some...Ch. 29 - Penzias and Wilson’s discovery of the Cosmic...Ch. 29 - Construct a timeline for the universe and indicate...Ch. 29 - Suppose the Hubble constant were not 22 but 33...Ch. 29 - Assume that the average galaxy contains...Ch. 29 - The CMB contains roughly 400 million photons per...Ch. 29 - Following up on Exercise 29.27 calculate the...Ch. 29 - Continuing the thinking in Exercise 29.27 and...Ch. 29 - Continuing the thinking in the last three...Ch. 29 - There is still some uncertainty in the Hubble...Ch. 29 - It is possible to derive the age of the universe...
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- Why cant an open universe have a center? How can a closed universe not have a center?arrow_forwardWhat exactly is dark matter?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_forward
- Which of the following were given as evidence supporting the Big Bang Theory? The red shift in star spectra Microwave energy across the universe at approximately 3 degrees Kelvin The abundance of light elements in the universe a I only b II only c I and II only d I, II, and IIIarrow_forwardThe light coming from stars is closer to red (long wavelength, low frequency) than we would expect. What does this imply? Your answer: the universe is expanding the universe is rotating the universe is shrinking the universe is staticarrow_forwardA 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_forward
- Why is Hubble’s law considered one of the most important discoveries in the history of astronomy?arrow_forwardAssume 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. Value: n = 4*1080arrow_forwardF2 3 #m E Which of the following did NOT happen during the first few minutes after the Big Bang? D O matter and antimatter collided and turned into energy O two or three of the simplest elements fused together O temperatures throughout the universe were hotter than the cores of stars are today some very massive early stars formed с O energy was converted to matter F3 $ 4 R F F4 Q Search % 5 V F5 T ㅁ G O 6 F6 Y B H F7 & 7 COO PrtScn с F8 8 Home L J umien A F9 Aunty Bindungen in Surinam 9 www.mark N M End K F10 Oarrow_forward
- What are the three important pieces of evidence that led scientists to accept the Big Bang as the most likely model for the origin of the universe?arrow_forwardWhat is the difference between hot dark matter and cold dark matter? What difference does that make to cosmology?arrow_forwardTwo students in a science club argue with each other regarding the concept of Redshift. The statements made by the students are given as follows: Student 1: When the absorption maxima shift towards longer wavelengths then it is called the Redshift. Student 2: The decrease in wavelength due to the Doppler effect is known as the Redshift. Which of the above statement/s is/are correct? (a) Both student 1 and student 2 are true. (b) Only student 1 is true. (c) Only student 2 is true. (d) Both student 1 and student 2 are false.arrow_forward
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