The Moon or­bits a point in­side Earth

Science Illustrated - - GRAVITY -

The in­vis­i­ble point that two ob­jects are or­bit­ing is the cen­tre of mass. When the one ob­ject is much larger than the other, such as Earth and the Moon, the point is lo­cated in­side the large ob­ject, which sways slightly around it. When two ob­jects are about the same size, such as in a bi­nary star sys­tem, the point is lo­cated ap­prox­i­mately in be­tween them.

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