What Was the Implication of the Observation by Edwin Hubble

question 433

Multiple Choice

What was the implication of the observation by Edwin Hubble that the Cepheid variable stars he measured in the Andromeda "nebula" appeared to be very faint compared with what was expected?

• A) The observed period was affected by the intense gravitational field of the "nebula" as predicted by general relativity, leading to incorrect luminosity determination.
• B) The Andromeda "nebula" was very far away and was in fact a galaxy.
• C) Hubble had discovered a new class of intrinsically faint Cepheid variable stars.
• D) Dust and gas in the "nebula" had severely reduced the light from these stars.

---

Definitions:

Hostility

Unfriendly or aggressive behavior towards people or ideas.

Menstrual-Cycle Findings

Research outcomes or observations related to the physiological changes and symptoms experienced by women throughout their menstrual cycle.

Biological Clock

An internal mechanism that regulates physiological and behavioral functions in a rhythmic cycle, such as the sleep-wake cycle.

Circadian Rhythms

Biological processes that display an endogenous, entrainable oscillation of about 24 hours, influencing various physiological functions.