Giant Impact Theory At the time Earth formed 4.5 billion years ago, other smaller planetary bodies were also growing. One of these hit earth late in Earth's.

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Presentation transcript:

Giant Impact Theory At the time Earth formed 4.5 billion years ago, other smaller planetary bodies were also growing. One of these hit earth late in Earth's growth process, blowing out rocky debris. A fraction of that debris went into orbit around the Earth and aggregated into the moon

How Long is one Month? It depends: From Earth, the Moon takes 29.5 days to complete one orbit around the Earth. , the moon takes 27.3 days to go around the Earth Complete one orbit.

During the course of 27 days, the Earth has moved around a substantial part of its orbit about the Sun. It takes an extra 2 days for the Moon to “catch up” with the Earth.

What Causes the Phases of the Moon? The lit side of the Moon always faces the Sun. Because of the motion of the Moon relative to the Sun, we see different amounts of lit and dark sides over the course of a month.

What Causes the Phases of the Moon?