Coruscant is the capital world of the Galactic Republic. The whole planet is covered with architectural design, in other words, it is covered with skyscrapers and many buildings, levels, and transport tubes. When you reach a certain level toward the planet's natural surface, which hasn't seen the light of day for many years, the level has it's own weather. You will find creatures like the duracrete slug and worm, the stone mite, granite slugs, and hawk bats. Also in Coruscant you will find, towards some of the lower levels, the Glow Spider, in which is Nici the Specialist who will set you up with some fake IDs, and if need be, alter your retinas so the Imperials or others cannot find you so easily.