Suppose We Observe a Cepheid Variable in a Distant Galaxy

question 64

Multiple Choice

Suppose we observe a Cepheid variable in a distant galaxy.The Cepheid brightens and dims with a regular period of about 10 days.What can we learn from this observation?

• A)It will allow us to calculate the rotation rate of the galaxy.
• B)It will allow us to determine the mass of the galaxy.
• C)We can learn the distance to the galaxy.
• D)Under the rules of the International Astronomical Union,we will be entitled to naming rights for the galaxy.

---

Definitions:

Clavicle

A long bone that serves as a strut between the shoulder blade and the sternum or breastbone, commonly known as the collarbone.

Solid Matter

Substances that are firm and maintain a fixed volume and shape, as opposed to liquids or gases.

Bone

A dense, hard connective tissue composing the skeleton of most vertebrates, providing support, protection, and aiding in movement.

Calcified

Having deposits of calcium salts within tissues, which can indicate aging or pathological changes.