Just added every single planet (with the exception of some moons), in our solar system, to the mod. They are all intractable, meaning you can land on them, all except the gas giants which you can only fly around in the atmosphere of.
Say thanks to @nkjellman for that one 
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@nsh3t I don't think so, our mod doesn't effect game files, it's just a series of scripts and a single dlc pack. Plus we where recently featured on GTA 5 Steam news.
@LastGamer29 Simple youtube math 101
Cancer + Non-cancer = More Cancer
@LastGamer29 You can use any vehicle you want. 
