Why is the temperature at the region of a sunspot cooler than the photosphere?
a. They are holes in the photosphere that reveal the lower temperature gases in the deeper layers.
b. They represent points where streams of cool gas from the corona lower the temperature in those regions of the photosphere
c. Powerful magnetic fields in the sunspots act upon the atoms of the photosphere to prevent them from emitting light.
d. Powerful magnetic fields inhibit the convective flow of the gases of the photosphere downward allowing them to cool for longer than would normally be permitted.
Question 2Which of the following is not a characteristic of the stars of the disk component of our galaxy?
a. circular orbits
b. randomly inclined orbits
c. higher metal abundance
d. young stars
e. star formation regions
Question 3The rotation of the Sun's photosphere is
a. fastest at the equator, slower at mid-latitudes, and slowest near the poles.
b. slowest at the equator, faster at mid-latitudes, and fastest near the poles.
c. fastest at the equator, slowest at mid-latitudes and the poles which travel at the same speed .
d. the same regardless of latitude.
Question 4Who first calibrated the Cepheid variable stars for use in determining distance?
a. Henrietta Leavitt
b. Edwin Hubble
c. John Glenn
d. Carl Sagan
e. Harlow Shapley
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