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Answer to Challenge Question (p. 31 of Max Goes
to the Moon):
When we see a new moon, people on the Moon would see a full
Earth. To understand why, look at the picture
on p. 31. We see new moon when the Moon is directly between
the Sun and the Earth. Thus, people on the Moon at that time would
be looking at the sunlit face of the Earth, which means a full Earth.
If you want to understand this better, try the
Phases of the Moon tutorial.
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