The Aether is a modded dimension in the PC version of Minecraft. It's basically the opposite of the Nether as it's supposed to look as if you are in heaven (rather than in hell). In the vanilla version of Pocket Edition there are really just two dimensions to visit: the Overworld and the Nether. This map lets you experience walk through a portal which takes you to the Aether.
How to go to the Aether?
Just to be clear, this dimension isn't really existent. It's just a map which copies some of the things found in the Aether and brings a similar experience to Minecraft Pocket Edition.
Once you've spawned you will find yourself in a small house in a forest. Exit the house to find the Aether portal. When you are ready, walk into the portal!
If you've played the mod which adds the Aether to Minecraft for PC you will find many similarities in the Minecraft PE world. The trees' leaves are yellow and the grass has a blue toned color.
There are some inhabitants of the world which can be found on the other side of floating island.
Liked this map? Then have a look at The End City map! It's quite similar, but another dimension.