Alien worlds are world types purchasable for $0.99 or the Essentials Pack. They exclusively have Ravines and Floating islands. You can view a distant planet that resembles Earth if you look at the horizon. There are also floating blocks which lets Minecraft fans play Skyblock.
Alien Ravine

A few ravines in Alien World

Alien Purchace

The purchase screen for Alien world.

Trivia Edit