It took two centuries for the Copernican model to replaced the ...

[lidoalex]

It took two centuries for the Copernican model to replaced the Ptolemaic model because
 
  A) in Copernicus' time, there were no telescopes.
  B) the Church wouldn't let anyone talk about Copernicus' model for 200 years.
  C) there was no scientific evidence to support either model until Galileo made his observations.
  D) the Ptolemaic model was simpler and more aesthetically pleasing.
  E) the Copernican model required complicated new terms to explain it correctly.

Question 2

Arcturus shows a large proper motion, almost perpendicular to the galactic plane. What Population does it belong to, and why?
 
  What will be an ideal response?

[mjbamaung]

Answer to Question 1

C

Answer to Question 2

Arcturus is the brightest Population II star in the sky, revealed by its lack of metals and its comet-like motion cutting across the galactic disk.

[lidoalex]

Thank you!

[mjbamaung]

Always glad to help...