I have heard that the moon is getting farther away from the Earth, why is this?
I have heard that the moon is getting farther away from the Earth, why is this?
user
Oh, that’s easy!  The Earth orbits the sun in an elliptical path.  Because of this, the moon’s orbit is slightly eccentric, which means it’s a little closer to us when it’s on the “near” side of the earth, and a little farther away when it’s on the “far” side.
assistant
I mean that the orbit of the moon is getting farther out from the Earth.
user
Oh, that’s also easy!  The moon moves faster when it’s closer to the Earth, and slower when it’s farther away.  The moon’s acceleration and deceleration as it moves out from the Earth depends on the position of the Earth relative to the sun.  So the distance between the Earth and the moon depends on the amount of time the moon spends farther away and closer to the Earth.
assistant
Was the Moon ever closer to the Earth than it is now?
user
When the moon was first formed from the debris left over from the birth of the Earth, it was a little closer to us.  But its orbit expanded over time because of tidal friction with the Earth.  This is similar to the way a river or lake expands as it flows from a high place to a low one.
assistant
I bet it was bigger in the sky and the ocean tides were stronger.
user