Earth is the third planet from the Sun, and humanity's home planet. It is populated by thirty billion humans, and governed by the United Nations. Its only moon is Luna, which is also under UN jurisdiction. The UN runs its activities out of The Hague.
On Earth, due to the large amount of people and resources, not everyone works; instead they have the option of either going to college & getting a job or just living off of the government with what is known as "basic support". When you apply to a university, you must have at least a year of work credits so they know you like working and don't waste classroom space on people who will just go on basic.