Anti Earth

Anti Earth was created when the impact that created the moon also transferred much of the water and atmosphere to the moon making the Earth the Moon. Anti Earth is a double planet in the Sol system. Anti Earth is the smaller of the two (known simply as Earth to the native sentient hominids) and has its solar wind protection through the unusually large magnetic field of the Moon.

Inhabitants
Anti Earth is Inhabited by a sentient race of octopus called the Narrets. The Narrets have created an underwater empire by grafting coral to create buildings and walkways. They communicate through changing colour.