Mercury (Sol I) is the first planet from the sun of the Sol system, United Empire of Earth (UEE). An iron planet, has been extensively mined and stripped of most of its natural resources. When Humans first began mining planets other than their homeworld Earth (Sol III), hundreds of miners and maintenance workers died on Mercury due to equipment that failed under the heat of the Sun. In 2398, the United Nations of Earth (UNE) erected a memorial to those who lost their lives during this dangerous time.