________ is (are) produced by atomic transitions in the presence of a strong magnetic field.
a. Differential rotation
b. Granules
c. The Zeeman effect
d. Spicules
e. The coronal hole
Question 2
Direct motion of a planet is its normal motion ____________ among the stars.
a. west to east along the ecliptic
b. east to west along the ecliptic
c. west to east along the celestial equator
d. east to west along the celestial equator