Terra was a distant planet orbiting the star Sun-X45-266. It was a near-perfect duplicate of Earth, but with certain differences. Their equivalent of Florida is much larger, for example. Also, the city of Macropolis takes the place of Metropolis on Earth. Additionally, Marvel Maid takes the place of Supergirl and Marvel Man takes the place of Superman, both refugees of a destroyed civilization at Terra's center. ("The Second Supergirl!")