Cosmic Perspect: Stars...-With 2 Access
Cosmic Perspect: Stars...-With 2 Access
7th Edition
ISBN: 9780321928177
Author: Bennett
Publisher: PEARSON
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Chapter 1, Problem 27EAP

The total number of stars in the observable universe is roughly equivalent to (a) the number of grains of sand on all the beaches on Earth. (b) the number of grains of sand on Miami Beach. (c) infinity.

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Assume the observable Universe is charge neutral, and that it contains n nuclei (hydrogen plus helium nuclei, ignoring other elements).  Take the helium mass fraction as 1/4.  How many electrons are there in the observable Universe?  Enter your answer in scientific notation with one decimal place.
Assume the observable Universe is charge neutral, and that it contains n nuclei (hydrogen plus helium nuclei, ignoring other elements).  Take the helium mass fraction as 1/4.  How many electrons are there in the observable Universe?  Enter your answer in scientific notation with one decimal place.   Values:  n = 1*10^80
What is the speed of light? Is it constant all over the universe?

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Cosmic Perspect: Stars...-With 2 Access

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