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Author Question: The visible parts of galaxies contribute about 10 percent of the critical density of the universe. ... (Read 74 times)

Jipu 123

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The visible parts of galaxies contribute about 10 percent of the critical density of the universe.
 
  Indicate whether the statement is true or false

Question 2

Answer each of the following questions for our local sky.
 
  A. Where is the north celestial pole in our sky?
  B. Is Polaris a circumpolar star in our sky? Explain.
  C. Describe the meridian in our sky.
  D. Describe the celestial equator in our sky.



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lauravaras

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Answer to Question 1

FALSE

Answer to Question 2

A. Answers will vary with latitude; here is a sample for 40N: The north celestial pole appears at an altitude of 40, in the direction due north.
B. Yes, for any location in the Northern Hemisphere; no, for any location in the Southern Hemisphere. Polaris is circumpolar because it never rises or sets in our sky. It makes a daily circle, less than 1 in radius, around the north celestial pole.
C. The meridian is a half-circle that stretches from the due south point on the horizon, through the zenith, to the due north point on the horizon.
D. Answers will vary with latitude; here is a sample answer for 40N: The celestial equator is a half-circle that stretches from the due east point on the horizon, through an altitude of 50 due south, to the due west point on the horizon.




Jipu 123

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Reply 2 on: Jul 27, 2018
Gracias!


nyrave

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Reply 3 on: Yesterday
Wow, this really help

 

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