Universe: Stars And Galaxies
Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 18, Problem 37Q
To determine

The correct chronological order of stages in the evolution of young star.

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Place the following events in the formation of stars in the proper chronological sequence, with the oldest first and the youngest last. w. the gas and dust in the nebula flatten to a disk shape due to gravity and a steadily increasing rate of angular rotation x. a star emerges when the mass is great enough and the temperature is high enough to trigger thermonuclear fusion in the core y. the rotation of the nebular cloud increases as gas and dust concentrates by gravity within the growing protostar in the center z. some force, perhaps from a nearby supernova, imparts a rotation to a nebular cloud y, then z, then w, then x z, then y, then w, then x w, then y, then z, then x z, then x, then w, then y x, then z, then y, then w MacBook Air on .H. O O O O
As a cluster of stars begins to age, which type of star in the cluster will move off the main sequence of the H-R diagram first?   1) all the stars in a cluster are born at the same time; so they will all move off the main sequence at the same time, as they evolve   2) G type stars, like our Sun   3) M type stars, which are the coolest   4) the lowest mass stars, which have the least amount of fuel for fusion   5) the O and B type stars
Select all of the statements about the main sequence stage in the life of a star that are TRUE:   All stars spend the majority of their lives in the main sequence stage.   Most stars lose a significant amount of mass while they are on the Main Sequence.   Different stars spend a different amounts of time (number of years) in the main sequence stage, depending on the characteristics they were born with.   Main sequence stars are rare in the Galaxy, so we are lucky to be living around one.   During the main sequence stage, energy to power the star is provided by the fusion of hydrogen.
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