[tet68]

So the moon is made up from earth and some other body,
but which one? Mars? or something else?

And if earth where on earth did it come from?

Inquiring minds want to know, this is not something
you would discover in Weekly World NEws.

Or maybe it IS ! At least if alien cross dressers are involved.

[inquest]

It wouldn't have been Mars. What scientists think is that some random planet about the size of Mars crashed into the earth and merged with it, causing it to violently quiver and quake. This process then resulted in pieces of the earth's crust being spat out into space, eventually forming a ring, like Saturn's rings. And then after that, the ring eventually coalesced into the moon.