ExtraPlanets Mod 1.12.2/1.10.2/1.7.10 adds a lot of dimensions, planets, with moons, blocks, items, and entities to the game. It is an add-on for the Galaticraft mod.

Main Features of ExtraPlanets by MJRlegends
The ExtraPlanets Radiation Calculator is to find how long you should stay on a planet/moon depending on some variables. Remember to check the following list!
4-10 Tier Rockets
Custom achievements
Custom batteries
Custom config options
Custom launch pads
Custom machines
Custom ores
Custom radiation and pressure system
Custom space suits tier 1-4
Custom tools
Custom vehicles
Dungeons Tier 4-10
Electric Rocket
Extended Galaticraft galaxy map screen with more info
Multi Biome system
New galaxies/galaxies selector
Space stations
Tier 2-4 Thermal Armor
Upgraded versions of a few devices from Galaticraft
Various gravity/temperature/day length
Villages
Compatibility:
This is the support relating to:
Forge Microblocks
NEI/JEI
Extreme Reactors
Craft Tweaker
Dynamic Surroundings
Modula Power Suits Compact
More Planets Rocket Crusher
Planet Progressions
Collection of planets:
Ceres
Eris
Haumea
Jupiter
Kepler
Kepler 47b
Kepler 47c
Kepler 62b
Kepler 62c
Kepler 62d
Kepler 62e
Kepler 62f
Kepler 69b
Kepler 69c
Kuiper Belt
MakeMake
Mercury
Neptune
Pluto
Saturn
Uranus
Venus
Moons:
Jupiter: IO, Europa, Ganymede, Callisto
Mars: Phobos, Deimos
Neptune moons: Triton
Saturn: Rhea, Titan, Iapetus
Uranus: Oberon, Titania
ExtraPlanets is a mod for Adventure and RPG. It provides another technology together with other strange additions. It’s essential to download and install Minecraft Forge!
How to install ExtraPlanets Mod:
Assure that you have already installed Minecraft Forge
Define the location of the Minecraft application folder.
On the windows, open Run from the Start Menu, write %appdata% and click to Run
Open Mac on the finder, press and hold Alt and click to Library on the peak of the Menu Bar. Open the Application Support directory and look for Minecraft.
Put ExtraPlanets Mod you have already downloaded (.jar) into Mods directory.
When you start using Minecraft, open the mod button, you will realize that ExtraPlanets Mod has been set up.