The Earth's gravity keeps the moon in orbit.
The earth is six times more massive than the moon. That keeps the moon in orbit around it, just as the mass of the sun keeps the earth in orbit around it.
The balance between the inertia of the Moon and the gravitational pull keeps the moon in orbit with Earth.
The Earth's gravitation.
The attraction of gravity between the Earth and the Moon.
Gravity keeps things together here on Earth. It keeps the Earth together in the first place, and it keeps us on Earth. It keeps the Earth in orbit around the Sun, and it keeps the Moon in orbit around Earth.
That's the mutual force of gravitation (gravity) between the Earth and the Moon. This, combined with the Moon's velocity (its inertia), results in the orbital path that the Moon follows.
The Earth.
it keeps the earth from being LIGHT all the time
The gravitational pull of the earth. Gravity from the Earth pulls the moon towards it.
Gravity.
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