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 2CC
To determine

Whether most of the carbon present in our body, came from stars, where the carbon atoms were formed, through a supernova explosion or stellar wind.

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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?
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

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