What Was Henrietta Leavitt's Most Important Contribution to Astronomy

question 5

Multiple Choice

What was Henrietta Leavitt's most important contribution to astronomy?

• A) the spectral typing of stars
• B) the relationship of stellar spectral type to temperature
• C) the period-luminosity relation of Cepheid variables
• D) the discovery of interstellar reddening

---

Definitions:

Hans Selye

A Hungarian-Canadian endocrinologist who is recognized for his research on the effects of stress on the human body and for developing the concept of the General Adaptation Syndrome.

Chronic Hypertension

A condition where an individual has persistently high blood pressure over a long period, often leading to health complications.

Exhaustion Phase

The final stage of the body's response to prolonged stress, characterized by depleted energy reserves and diminished resistance to illness.

Chronic Stress Phase

A prolonged period of stress without adequate relief, leading to various physical and psychological health issues.