Cosmic Perspective Fundamentals
Cosmic Perspective Fundamentals
3rd Edition
ISBN: 9780134988504
Author: Bennett, Jeffrey O., Donahue, M. (megan), SCHNEIDER, Nicholas, Voit, Mark
Publisher: Pearson,
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Chapter 12, Problem 20SEQ

Explain all answers clearly, with complete sentences and proper essay structure if needed. An asterisk (*) designates a quantitative problem, for which you should show all your work.

Distances Between Galaxies. If you were to divide the present-day universe up into cubes with sides 10 million light-years long, each cube would contain, on average, about one galaxy similar in size to the Milky Way. Now suppose you traveled back in time, to an era when the average distance between galaxies was one-quarter of its current value. How many galaxies similar in size to the Milky Way would you expect to find, on average, in cubes of the same size? In order to simplify the problem, assume that the total number of galaxies of each type has not changed between then and now. Based on your answer, would you expect collision, to be much more frequent at that time or only moderately more frequent?

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Please help me answer part A and B
State the definition for a parsec, and derive its value in terms of As- tronomical Units. Convert your answer for the value of the distance of a parsec in Astronomical Units into light years. Be sure to include a large and clearly labeled diagram showing how you arrived at your conclusions. Be sure to show all work!
Please show your solution and at the same time BOX the answers that corresponds to each blank on the question. Make sure to fill all the blanks. Thank you.  STRICKLY FOLLOW THIS: Calculated Answers Express your answers without rounding off and without scientific notation unless instructed otherwise. Multiple Blanks Write powers or subscript as is. Ex: Use b2 if you mean b2 or b2 Spell out Greek letters. Ex: Use pi if you mean greek letter pi Write answers without spaces. Ex: Use 2epsilon0r3 if you mean 3e0r3 Write fractions with a slash. Ex: Use 1/2
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