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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Stellar evolution
We may see thousands of stars in the dark sky. Our universe consists of billions of stars. Stars may appear tiny to us but they are huge balls of gasses. Sun is a star of average size. Some stars are even a thousand times larger than the sun. The stars d…
Red Shift
It is an astronomical phenomenon. In this phenomenon, increase in wavelength with corresponding decrease in photon energy and frequency of radiation of light. It is the displacement of spectrum of any kind of astronomical object to the longer wavelengths…
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Chapter 18, Problem 2Q
To determine

The reason for facing difficulty to study the life cycle of the star than the life cycle of plants or animals.

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Consider three main sequence stars: Star A is 14,500 K, Star B is 2,900 K, and Star C is 5,500 K. What are the colors of each of these stars?
Stars formed after the Big Bang had cooled down. From globular cluster dating and from stellar uranium spectrum, what is the approximate age of the oldest known stars?   6,000 years         4.6 billion years         7 billion years         12 billion years         13.8 billion years
If a star converted every bit of its mass into energy the conversion efficiency would be 100%. However, no star is this efficient in its energy production. Stars with less than 1.3 solar masses (most stars are less than 1.3 solar masses) convert hydrogen into helium with an efficiency of only 0.7%. Bearing in mind that the Sun has a mass of 2 × 1030 kg, how long will it live if it converts all of its hydrogen into helium with an efficiency 0.7%? Please note that it won't actually convert all of its hydrogen into helium so this is a rather optimistic upper limit for the lifetime of the Sun. Also, 1 year = 365.25 days.Lifetime = _________ years

Chapter 18 Solutions

Universe: Stars And Galaxies

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