From Earth, due to their motions and the fact that the Sun lights only a portion of eachsurface, both Mercury and the Moon:
A)always look full from Earth.
B)appear to go through phases.
C)pass through Earth's shadow.
D)appear to be half-lit by the Sun.
E)always have the same side facing Earth.

Question

Quizplus · Accepted Answer

Both Mercury and the Moon appear to go through phases as seen from Earth. This is because their position with respect to the Sun and Earth changes, causing different portions of their surface to be illuminated by the Sun. Both Mercury and the Moon appear to go through phases when viewed from Earth. This is because as they orbit around the Sun (in the case of Mercury) or around the Earth (in the case of the Moon), their relative positions to the Sun and the Earth change, causing different portions of their surfaces to be lit up by sunlight as seen from Earth.

From Earth, Due to Their Motions and the Fact That