1. Who discovered that, when viewed through a telescope, the Milky Way is resolved into
thousands of individual stars?
a. Tycho Brahe
b.Galileo Galilei
c. Isaac Newton
d. William Herschel
e. Jacobus C. Kapteyn
2. What main conclusion did the Herschels draw from their star counts?
a.The Milky Way is a disk of stars with the sun near the center.
b.The center of the Milky Way is far away in the constellation Sagittarius.
c. All stars have about the same luminosity.
d. The sun's luminosity is much higher than that of the average star.
e. The Milky Way extends out an infinite distance.
3. Which type of pulsating variable star is the most luminous?
a.Long-period Cepheid variables.
b.Medium-period Cepheid variables.
c. Short-period Cepheid variables.
d. RR Lyrae variables.
e. All pulsating variables have the same average luminosity.
4. What feature of the Cepheid variables that were studied by Henrietta Leavitt in 1912 allowed
her to conclude that the period-apparent brightness relation she observed was in fact a period-
luminosity relation?
a. The Cepheids that she observed were all the same average apparent magnitude.
b.The Cepheids that she observed were all eclipsing binaries.
c. The Cepheids that she observed were at the same distance.
d. The Cepheids that she observed were all the same color.
e. The Cepheids that she observed had the same period.
5. What type of stars are the Cepheid variables?
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- Fall '11
- susanbontems
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