Instead, the Moon's phase depends only on its position relative to Earth and the Sun. The Moon doesn't make its own light, it just reflects the Sun's light as all the planets do. The Sun always illuminates one half of the Moon.Earth's shadow cast on the Moon.
Some people assume the phases are caused by the Earth's shadow cast on the Moon. The Moon's phase is determined solely by its location in relation to the Earth and the Sun. The Moon, like all the planets, does not produce its own light; instead, it reflects the Sun's light. One half of the Moon is still illuminated by the Sun.
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