An object at rest will stay at rest.
This is Newton's first law of motion or the "law of inertia"
We did not use fuel to propel the Apollo space craft to the moon or from the moon to the Earth. Fuel was used to escape the gravitational field of the Earth and later the Moon. Fuel was used to push the Apollo spacecraft in the direction it needed to go.
But once the Apollo space craft was moving toward the moon or toward the Earth, no fuel was used for propulsion. The Apollo space craft continued to move through empty space. There was no friction of an atmosphere to stop the Apollo space craft. Inertia was the means of Space travel to the moon. The gravitational forces of the Moon and Earth also came into play as the Apollo capsule approached them.
|Earth Rise from the Moon Courtesy of NASA taken by astronaut Frank Borman|