Aphelion/doc/Aphelion/Tiers/Tier 2 - Orbits and Interplanetary Travel.md

Gameplay goals: This tier is marked by the construction of a Space Stations. These platforms allow orbital bases, and Interplanetary Travel. Station Rocket Engine allow for rocket fuel powered propulsion to travel between Planets. Players are expected to have visited The Moon to obtain materials needed to construct a space station. Nuclear Power may also become available here. After unlocking interplanetary travel, materials needed to create Ion Engines become available.

Materials: Titanium (Structural) Uranium (Power) Cobalt (Secondary resource for reactors and alloys?)

Machines: Station Flight Computer Nuclear Fission Reactor Oxygen Distributor Gravity Generator Vacuum Arc Furnace (Titanium processing) Station Rocket Engine