COSMIC PERSPECTIVE
COSMIC PERSPECTIVE
9th Edition
ISBN: 9780135729458
Author: Bennett
Publisher: PEARSON
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Chapter 16, Problem 44EAP
To determine

To Describe: Life history of a protostar from its beginning and its differencefrom the life when protostar is formed in a cloud without any angular momentum.

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Based on what you learned about stellar structure and how stars maintain their stability, select all of the correct statements from the following list. 1. The weight pressing down on a layer of gas in a star is balanced by the pressure in the gas. 2. The interior of the lowest-mass stars transfers energy mostly through convection. 3. Energy in a star flows from the core to the surface. 4. More massive stars produce energy with the proton-proton cycle. 5. Less massive stars produce energy with the CNO cycle. 6. Conduction is an important method of energy transport in stars. 7. Stars are hotter in their cores than on their surfaces.
All massive main sequence stars reside in clouds of glowing gas. The four powerful stars in the center of the Orion Nebula are good examples. Lower mass stars like the Sun generally don't have clouds of gas around them. a. Why do powerful stars reside in gas clouds? b. What is making the gas glow exactly? For the last question, refer to the surface temperature of these stars, and to Wien's Law.
Astronomers studying regions like the Orion Giant Molecular Cloud have observed that a wave of star formation can move through them over many millions of years.  What sustains such a wave of star formation in a giant molecular cloud? A. radio waves from complex molecules move slowly through the cloud, causing stars to form B. when a group of stars form, they remove so much material from the cloud that only a big empty place is left, into which new matter from other clouds falls, making more stars C. when giant molecular clouds collide with each other, they do so not just once, but many times D. the dust in these clouds is so heavy, it is always settling inward toward the cloud's center causing star formation in its wake
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