In the Great Debate of 1920,Curtis and Shapley argued about whether spiral and elliptical nebulae were inside or outside of the Milky Way.These objects are now known as:
A) dark matter.
B) supermassive black holes.
C) galaxies.
D) globular clusters.

Question

Quizplus · Accepted Answer

The spiral and elliptical nebulae discussed in the Great Debate of 1920 are now known as galaxies. Dark matter and supermassive black holes were not yet discovered or understood at that time. Globular clusters are groups of stars within galaxies, but they were not the subject of debate in Curtis and Shapley's discussion.

In the Great Debate of 1920,Curtis and Shapley Argued About