Mercury (4-Space)

Mercury is the planet closest to the sun and can be accessed using a Tier 2 Rocket or higher. Light gray colored Mercury Surface Rock covers the surface of Mercury. Large mountains, craters, caves, ravines and dungeons can be found on Mercury.
Mercury has no oxygen, is very hot during the daytime and is very cold in the nighttime. The player will have to wear the entire Oxygen System (Oxygen Mask, Oxygen Gear and Oxygen Tank) and Thermal Padding to survive. 
Mercury Iridium Ore, Mercury Meteor Ore, Mercury Tin Ore, Mercury Copper Ore, Mercury Crystal Ore and Mercury Gold Ore are the ores that generate in Mercury.
The gravity on Mercury is 38% the gravity on the Overworld. 
Evolved Zombies, Evolved Spiders, Evolved Skeletons, and Evolved Creepers spawn on Mercury.