Answer 1:
Good question :) If we compare a new moon day and
a full moon day, stars will appear very brightly
in new moon day. Why? During the night,
what are the first thing you see in the night
sky? The moon! Well, around full moon, the
moon casts a lot of light, which outshines other
celestial galaxies or star clusters. This is
why people who want to look at big dipper or other
star symbols avoid looking at the moon with a
telescope.
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Answer 2:
Stars have the same brightness no matter what
is in the sky, but our eyes adapt to the amount of
light that we see. This means that the more
light there is around, the harder it is for us to
see faint things. The full moon reflects a lot of
light, so while the stars are still there, we have
a harder time seeing them.
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