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Author Question: Why was Copernicus' model much simpler than Ptolemy's? What will be an ideal ... (Read 76 times)

Beheh

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on: Jul 27, 2018
Why was Copernicus' model much simpler than Ptolemy's?
 
  What will be an ideal response?

Question 2

Two separate pairs of binary stars are observed. The separation of the pairs is identical, but the orbital period of Pair X is 4 times the orbital period of Pair Y.
 
  How does the total mass of the stars in Pair X compare to the total mass of the stars in Pair Y?
  A) Pair X has a total mass 2 times greater than Pair Y.
  B) Pair Y has a total mass 2 times greater than Pair X.
  C) Pair Y has a total mass 16 times greater than Pair X.
  D) Pair X has a total mass 16 times greater than Pair Y.


k2629

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Reply #1 on: Jul 27, 2018
Answer to Question 1

To duplicate retrograde motion, Copernicus merely had the planets lapping each other as they revolved around the Sun at varying speeds. Ptolemy needed a complex set of deferents and epicycles to explain retrograde motion in his geocentric model.

Answer to Question 2

C


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