What if the Earth had two moons? : Dimaan, Lluna, and Kuu
What if the Earth were a moon? : Mynoa and Tyran
What if the moon orbited backwards? : Anillo
What if the Earth's crust were thicker? : Dichron
What if the Earth formed fifteen billion years from now? : Futura
What if there were a counter-earth, a planet in Earth's orbit on the other side of the Sun? : Dopple I, II, and III
What if the Earth had formed elsewhere in the galaxy? : Kern I and II
What if the Sun were less massive : Dimune I and II
What if the Earth had two suns? : Zweisonne I, II, and III
What if another galaxy collided with the Milky Way? : Earth.
