Can you suggest a better list of key debates/questions in the history of...

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...astronomy? (see below)? I'm brainstorming an astronomy course for high school that focuses on a few key debates in astronomy as the springboard for discussions about science as a process, astronomical techniques, and astrophysics. Here is my brainstormed list- can you make comments, suggestions?

I.Earth flat or spherical? c. >500 BCE
II.Earth stationary or going around sun? c. 1500 CE – Copernican Revolution
III.Energy source for the sun and stars? – c. 1900 also stellar evolution & HR Diag.
IV.What does constancy of c mean? (Special relativity) – 1903
V.Spiral nebulae island universes or protoplanetary disks? c. 1920 “Great Debate” btw Curtis and Shapley
VI.Light – particle or wave? Quantum theory c. 1930
VII.What is gravity? General relativity and black holes, quasars c. 1925-1975
VIII.Red shifts and expanding universe – Slipher and Hubble (also discv. Of 3 deg. K background) mid 20th cen.
Last item can be put: is spacetime finite or infinite? etc.
 
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