The Famous Shapley-Curtis Debate in 1920 Concerned Which Fundamental Astronomical

question 56

Multiple Choice

The famous Shapley-Curtis debate in 1920 concerned which fundamental astronomical question in astronomy?

• A) whether all stars were like the Sun or fundamentally different
• B) whether the spiral "nebulae" were part of the Milky Way Galaxy or more distant, separate entities
• C) whether the universe was expanding outward in all directions
• D) whether the Sun was at the center of the Milky Way Galaxy

---

Definitions:

Age

The length of time that a person has lived or a thing has existed.

Hormone Replacement Therapy

A treatment used to supplement or replace hormones in individuals with hormonal imbalances or deficiencies.

Health Outcomes

The results of healthcare interventions and measures on the health status of individuals or populations.

Laboratory Tests

Diagnostic tests carried out in a controlled environment to analyze bodily fluids or tissues for the purpose of identifying diseases or disorders.