The region of a shadow that is totally shaded is known as the _____.
A) umbra
B) waxing crescent
C) penumbra
D) waxing gibbous
Question 2
Which of the following is true of first-magnitude stars?
A) They are the stars with the greatest flux.
B) They are the smallest stars in a constellation.
C) They are the oldest stars in a constellation.
D) They are the stars that are farthest from Earth.