Dimple Worlds

Worlds and habitats where only part of the surface has been terraformed

Dimple World
Image from Steve Bowers
Tien-Hsin Dimple World, a supramundane shell suspended over a Neptune-sized world in the MPA Middle Regions. Several deep dimples have been terraformed on the surface of this world, some of which share atmospheres, while others do no.

Worlds where only part of the surface has been terraformed. Most dimple worlds utilise artificial excavations or deliberate depressions in artificial surfaces, although some utilise natural features.

The earliest form of dimple world developed from low world houses built at the bottom of deep craters; some of these worldhouses were eventually extended to cover the whole planet or moon, until the world was completely paraterraformed. Other worlds have remained as separate dimples even in the current era. Not all natural crater-worlds have world-roofs, as some natural canyons and craters are deep enough to retain a dense atmosphere even though the datum surface level is at a much lower pressure. In many cases the edges of these natural depressions have been raised to reduce atmospheric losses or the floor of the depression is excavated further.

A significant number of dimple worlds exist on the outside of shell-worlds or supramundane shells; sometimes the majority of the surface of such worlds are used for other purposes, such as computation or as accommodation for clades which can tolerate or prefer low pressures. Quite often the individual dimple worlds on the largest of these structures have a surface area equal to, or greater than, natural Earth-like Gaian worlds. To travel between these separate dimples the inhabitants often use vac-trains or sub-orbital spacecraft.

Image from Steve Bowers
Pluton, a dimple world in Perseus

The world Pluton is an example of a dimple world that has been extended right around the equator of a world; the rest of the planet is inhabited by cold-loving Muuh.


Rotating City
Image from Paul Birch
A Rotating dome city, as imagined by Paul Birch
Crater-habitats on low-gravity worlds are sometimes configured to rotate in order to provide centrifugal gravity at the rim; these are often urbanised and known as rotacities. Clades that find low gravity problematic are often found living in these structures, especially around the edge where the gravity is strongest.

Image from Steve Bowers
A rotacity. These habitats are built inside craters or crater-shaped dimples or excavations. A rotating shell inside the crater gives various amounts of centrifugal gravity, ranging from zero at the centre to a maximum at the rim. This centrifugal gravity is (of course) additional to the natural gravity of the planet, moon or asteroid upon which the rotacity is constructed.
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Development Notes
Text by Steve Bowers
Initially published on 23 February 2015.