What happened when the moon 'turned itself inside out' billions of years ago?
The moon underwent a reversal around 4.2 billion years ago, flipping itself "inside out" after a giant impact to create the picture of the faithful lunar companion that we see today.
TroibNews 
The moon underwent a reversal around 4.2 billion years ago, flipping itself "inside out" after a giant impact to create the picture of the faithful lunar companion that we see today.
