Universe
Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 20, Problem 8Q
To determine

The manner in which the origin and evolution of life on Earth might have been affected if the convective zone in the AGB stars supposedly did not reach into their carbon-rich cores.

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In a globular cluster, astronomers (someday) discover a star with the same mass as our Sun, but consisting entirely of hydrogen and helium. Is this star a good place to point our SETI antennas and search for radio signals from an advanced civilization? Group of answer choices   No, because such a star (and any planets around it) would not have the heavier elements (carbon, nitrogen, oxygen, etc.) that we believe are necessary to start life as we know it.   Yes, because globular clusters are among the closest star clusters to us, so that they would be easy to search for radio signals.   Yes, because we have already found radio signals from another civilization living near a star in a globular cluster.   No, because such a star would most likely not have a stable (main-sequence) stage that is long enough for a technological civilization to develop.   Yes, because such a star is probably old and a technological civilization will have had a long time to evolve and develop there.
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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