Unformatted text preview: 17 kg/sec)? Assuming that only the 10% of the star’s mass in the central regions will get hot enough for fusion, then calculate the main sequence lifetime of the star. Put your answer in years, and compare to the lifetime of the Sun ( for the 60 solar mass star, 2.0 x 10 13 sec, or only about 625,000 years!). 3. Ch 19: #4, 9, 10 4. Ch 19: #13, 16, 17, 18 5. Visit and look http://antwrp.gsfc.nasa.gov/apod/astropix.html . Go into the archive (click on Discover the Cosmos!) at some pictures, which have descriptions from professional astronomers. Pick two especially beautiful ones and explain them in your own words. You can base your explanation on the text provided, but do not copy any part of it....
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- Spring '09
- 10%, energy generation, 1013 sec, 625,000 years