The semi major axis of an ellipse is
a. the ratio of the longest diameter of the ellipse to that of the shortest diameter of the ellipse.
b. half the length of the shortest diameter of the ellipse.
c. half the length of the longest diameter of the ellipse.
d. the distance between the two foci of the ellipse.
e. the ratio of the distance between the two foci to the length of half the longest diameter of the ellipse.
Question 2
The free-fall contraction of a molecular cloud
a. can be initiated by shock waves from supernovae.
b. can be initiated by nearby spectral type G stars.
c. can be initiated by the rotation of the cloud.
d. causes the cloud to become transparent to ultraviolet radiation.
e. causes the particles in the cloud to decrease the speed with which they move.
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