Luna

Luna is the only companion planetoid of Earth, the Federation capital planet. Luna is often referred to as a moon, but is in fact the second member of a binary planet system that it and Earth make up. (Spock's World.) Luna is inhabited, with such locales as New Berlin, Tycho City, and Lake Armstrong found on its pressurized surface. (Star Trek: First Contact.) In its pre-Unification times, many Humans on Earth referred to Luna as "the Moon." This has largely ceased in the modern era; however, many native Lunans, the descendents of Lunar colonists, still refer to Luna by the archaic name. ("Valiant" [DS9].)

In 2155, Luna was the location of the primary nexus of the Terra Prime terrorist movement. Luna was also full of a great many mining facilities from which Terra Prime operated. ("Demons" [ENT].)

Federation President Min Zife attended a diplomatic reception held on Luna in late 2379 shortly before his resignation. The reception was attended by such officials as the Ferengi, Gorn, Romulan, and Klingon ambassadors to the Federation, in addition to many members of the Federation Council. (A Time to Heal.)