Another brick in the Wall

Obligatory science post:

  • The Moon is a sphere and is constantly illuminated by the Sun on one side, meaning there’s always a dark side, too. Think about a flashlight and a basketball in a dark room; you can’t illuminate the whole ball, just one side.

  • One side of the Moon is always facing Earth. The other is always facing out into space. Always. That’s why the Moon always looks the same. The first time humans saw the far side was when we sent spacecraft to photograph it.

  • The Moon is tidally locked to Earth, meaning one side always points towards us.

  • So, there is a near side and far side of the Moon

  • Sometimes the near side is illuminated (a full moon) and sometimes the far side is illuminated (a new moon).

  • A lunar eclipse always happens during a full moon. A solar eclipse always happens during a new moon.

  • The Moon’s orbital period and rotational period are identical.

  • Bonus: The Moon is not only falling towards the Earth (gravity), but slowly slipping from its orbit as well. Every day the Moon is farther away than it was before.

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