The Diagram Illustrates Physical Size and Angular Size as Seen

question 9

Multiple Choice

The diagram illustrates physical size and angular size as seen by the observer. We can estimate the size in light years (or parsecs or km) of M31 from

• A) its angular size in degrees.
• B) its distance in light years (or parsecs or km).
• C) its angular size in degrees and its distance in light years (or parsecs or km).
• D) It is impossible to estimate the size of M31.

---

Definitions:

Theories

Systematic sets of ideas that explain phenomena or provide frameworks for understanding relationships between concepts.

Binge-Eating Disorder

An eating disorder characterized by binge eating that causes significant distress.

Anorexia Nervosa

An eating disorder characterized by excessive fear of becoming fat and therefore restricting energy intake to obtain a significantly low body weight.

Bulimia Nervosa

An eating disorder characterized by dieting, binge eating, and purging.