Which of the following is NOT true:

W) an eclipse of the Moon only occurs during a full Moon

X) Mercury will appear to be in its full phase when it is farthest from Earth

Y) an event horizon is associated with black holes

Z) no more than 50% of the Moon's surface can be seen over any one year
Z) NO MORE THAN 50% OF THE MOON'S SURFACE CAN BE SEEN OVER ANY ONE YEAR (Solution: libration will allow more than 55% to be seen over a year)