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.
suppose a planetary nebula is 2.8 pc in diameter, and doppler shifts in its spectrum show that the planetary nebula is 33 km/s. how old is the planetary nebula? 1 pc= 3.1 ×10^13 km and 1 yr= 3.2 × 10^7s
A star's Zero Age Main Sequence (ZAMS) radius R, luminosity L, and effective temperature Teff depend primarily on the star's mass. These parameters do evolve somewhat over time, however, while the star still remains on the main sequence. Discuss in what direction each of these parameters evolves, and explain why this occurs. By physical in your explanation. How did this evolution affect our own solar system, if at all?

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