The light of a full moon brightens a clear night, reflecting enough sunlight to cast shadows. But have you ever seen a full moon in summer when it first rises above the horizon? When it is low in the sky, the full moon often looks much larger than it will after it has risen higher; as it rises into the sky, the full moon seems to grow smaller. Our eyes see this, but cameras show that the moon stays the same size throughout its journey. The name of this phenomenon is the moon illusion, and scientists haven't yet agreed on what causes it. 1. The author includes the detail "reflecting enough sunlight to cast shadows" in order to -
A. illustrate how bright a full moon is
B. discuss the ways in which the moon acts as a mirror -
C provide evidence of how powerful the sun is
D remind the reader that shadows occur only at night
2. Which sentence explains why this event is called an illusion?
A The light of a full moon brightens a clear night, reflecting enough sunlight to cast shadows.
B When it is low in the sky, the full moon often looks much larger than it will after it has risen higher; as it rises into the sky, the full