Understanding Our Universe
3rd Edition
ISBN: 9780393614428
Author: PALEN, Stacy, Kay, Laura, Blumenthal, George (george Ray)
Publisher: W.w. Norton & Company,
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Chapter 17, Problem 17QAP
To determine
In which type of dark matter neutrino exists.
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Dark Matter and Closure• Discuss the existence of dark matter.• Explain neutrino oscillations and their consequences.
20.
Gravitational lensing can be used to detect which component of the Universe?
a.
Dark Matter.
b.
Photons.
c.
Dark Energy.
d.
Electrons.
Dark matter experiments are built underground to avoid detecting which type of particle?
Group of answer choices
Cosmic Ray
Neutrons
Photons
Pions
Chapter 17 Solutions
Understanding Our Universe
Ch. 17.1 - Prob. 17.1CYUCh. 17.2 - Prob. 17.2CYUCh. 17.3 - Prob. 17.3CYUCh. 17.4 - Prob. 17.4CYUCh. 17.5 - Prob. 17.5CYUCh. 17 - Prob. 1QAPCh. 17 - Prob. 2QAPCh. 17 - Prob. 3QAPCh. 17 - Prob. 4QAPCh. 17 - Prob. 5QAP
Ch. 17 - Prob. 6QAPCh. 17 - Prob. 7QAPCh. 17 - Prob. 8QAPCh. 17 - Prob. 9QAPCh. 17 - Prob. 10QAPCh. 17 - Prob. 11QAPCh. 17 - Prob. 12QAPCh. 17 - Prob. 13QAPCh. 17 - Prob. 14QAPCh. 17 - Prob. 15QAPCh. 17 - Prob. 16QAPCh. 17 - Prob. 17QAPCh. 17 - Prob. 18QAPCh. 17 - Prob. 19QAPCh. 17 - Prob. 20QAPCh. 17 - Prob. 21QAPCh. 17 - Prob. 22QAPCh. 17 - Prob. 23QAPCh. 17 - Prob. 24QAPCh. 17 - Prob. 25QAPCh. 17 - Prob. 26QAPCh. 17 - Prob. 27QAPCh. 17 - Prob. 28QAPCh. 17 - Prob. 29QAPCh. 17 - Prob. 30QAPCh. 17 - Prob. 31QAPCh. 17 - Prob. 32QAPCh. 17 - Prob. 33QAPCh. 17 - Prob. 34QAPCh. 17 - Prob. 35QAPCh. 17 - Prob. 36QAPCh. 17 - Prob. 37QAPCh. 17 - Prob. 38QAPCh. 17 - Prob. 39QAPCh. 17 - Prob. 40QAPCh. 17 - Prob. 41QAPCh. 17 - Prob. 42QAPCh. 17 - Prob. 43QAPCh. 17 - Prob. 44QAPCh. 17 - Prob. 45QAP
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- Astronomers believe there are something like 100 million neutron stars in the Galaxy, yet we have only found about 2000 pulsars in the Milky Way. Give several reasons these numbers are so different. Explain each reason.arrow_forwardWhy do astronomers believe there must be dark matter that is not in the form of atoms with protons and neutrons?arrow_forwardWhich is likely to be more common in our Galaxy: white dwarfs or black holes? Why?arrow_forward
- 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_forwardBlack holes with masses smaller than those formed in supernovas may have been created in the Big Bang.Calculate the radius of one that has a mass equal to the Earth’s.arrow_forwardWhat exactly is dark matter?arrow_forward
- How black holes made us?arrow_forwardThe first evidence for the dark energy was that: a. the cosmic microwave background spectrum was a perfect black body. b. Einstein’s theory of gravity predicted that the Universe should collapse. c. Type Ia supernovae appeared dimmer than predicted by Hubble’s law. d. Cepheid variable stars showed that galaxies were farther away that thought. e. galaxies in clusters are moving too rapidly for the clusters to be bound.arrow_forwardExplain the expanding Universe theory and its relationship to the Big Bang theory?arrow_forward
- Calculate the Schwarzschild Radius for the following: 1. a black hole with the mass of you (estimate your mass to be 51.8 kg)arrow_forwardThe overall composition of the universe is Select one: Oa. 2% ordinary matter, 98% exotic dark matter Ob. 100% ordinary matter ©c. 15% ordinary matter, 85% exotic dark matter Cd. 5% ordinary matter, 25% exotic dark matter, 70% dark energy Carrow_forward1. 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 directionsarrow_forward
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