Lesson 12 - Our Galaxy: The Milky Way
Key Terms & Concepts
Page references are keyed to the Horizons textbook, Exploring The Universe, 11e.
1. variable star: A star whose brightness changes periodically. (p. 234; video lesson;
2. Cepheid vari
1. Who first calibrated the Cepheid variable stars for use in determining distance?
(p. 234; video lesson 12, segment 3; lesson 12, objective 1)
2. Which of the following is not a characteristic of the stars of the disk component of our
When the moon is located in a direct line and between Earth and
the sun, the phase is called
a. full moon.
b. last quarter.
c. new moon.
d. first quarter.
The correct answer is: new moon.
Mark 1.00 out