Planets Extended has moved! Due to a recent update, Mars was conflicted so I created a new system for my planets (I am planning to move them to one of the backer planet systems). It is the lower-right on the star map and called "Exploration and Discovery."
This mod will extend (most if not all) the unused planets in Aground and add a couple new ones.
Mercury (now Iron Planet) - has a landable area, some enemies (the magnewyrms will probably be changed), and it is not yet complete. (I plan to possibly add more enemies, perhaps an NPC, and a surprise) It has a variety of ores, including: sulfur, quartz, titanium, and exotic matter. It is a no oxygen planet. The core is liquid iron, but I am still working on it so it is unmineable at this point. It is the inner planet in the system.
Mars (now Red Planet) - has a landable area, an enemy (rogue rovers), has no oxygen, and is also not yet complete. (I plan to possibly add more enemies and the remains of a colony [the aliens would have bombed that out also, so it could be more like earth]). As with Mercury, it has a variety of ores, including two new ones, aluminum and magnesium, that are used to make steel-bars (they make a steel-like alloy, so it's close enough). The upper ores on Mars are similar to those on the actual planet, and it includes bands of ice underneath the surface as the real planet also has.
One of the planets has an npc. It allows one quest (a "find" one) by calling his planet on the com station. He allows construction of a new structure, but the resources are vastly more than the structure is currently worth. It will have an interior area with structures in the next major update.
Interior area for the structure (next major update),
More Mars and Mercury content (next major update),
Please let me know of any un-stated bugs and suggestions.
Known issues: Structure blueprint apparently conflicts (it did anyways) with one (or more) other mods, causing a crash. The reason is unknown as no other mod has the same blueprint.
david_maletz for the nice graphics and dwarf planet Mercury (and Mars to some extent) is modeled after.
me for bad graphics and code