21st Century Astronomy (sixth Edition)
21st Century Astronomy (sixth Edition)
6th Edition
ISBN: 9780393675504
Author: Laura Kay, Stacy Palen, George Blumenthal
Publisher: W. W. Norton & Company
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Chapter 22, Problem 29QP
To determine

The reason behind the objection of scientist to use the word theory to describe superstring theory.

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How did they get 0 and then 1250nm for the answers? Trying to study for a quiz can you guys help please
1. The current (critical) density of our universe is pe = 10-26kg/m³. Assume the universe is filled with cubes with equal size that each contain one person of m = 100kg. What would the length of the side of such a cube have to be in order to give the correct critical density? How many hydrogen atoms would you need in a box of 1 m³ to reach the critical density? The matter we know, which consists mostly of hydrogen, constitutes only 4.8% of the current critical energy density of our universe. So how many hydrogen atoms are actually in a box of 1 m3 in our universe? Deep space is very empty and a much better vacuum than we can obtain on earth in a laboratory.
When asked about his thoughts on a new scientific hypothesis, Wolfgang Pauli once said: “That's not right, that's not even wrong.” What fundamental principle of science was he alluding to? And why is the second part of this quote more important than the first?
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