Earth

Earth is the homeworld of the human race, the main planet of the Earth Republic in the Prime Universe, and the central home of humanity's civilization in several others. It is the third planet of the Sol system. It is at the center of a vast in-system industrial, scientific and commercial apparatus which reaches out as far as the Kuiper Belt.

Its moon is part of the planet's industrial network; it is one light second from the planet and is nominally called Luna. The moon is large for the planet's size and has an important effect on the Earth's tides, contributing to humanity's vital aquaculture. It is settled, holding many important civilian, governmental, military and industrial structures. There is no atmosphere on Luna and it has only one sixth of Earth's gravity, so structures on the moon use thick domes, life support, artificial gravity and hydroponic habitats.

Prime Universe
Earth has mostly escaped direct attack in the Prime Universe, up until the events of April 9, 2156, when the planet itself was hit by the Z's Howl superweapon, which hit the planet with repeated hyperspace matter and shockwaves. The planet was mostly protected by its atmosphere, but a hyperspace lightning storm gathered over the northern hemisphere and decimated the Toronto Metropolitan Area, killing four million people. The satellites of Earth Defense and all of the planet's communication and interplanetary industrial craft, up to the Sol Asteroid Belt, were destroyed.

December Universe
In the December Universe during the Battle of Earth, the Praezorians destroyed the Star Navy with overwhelming force and razed Earth. The human race was all but wiped out; a few survivors were found a couple years later, and live in the Prime Universe. Some hyperspace transport crews and individuals from smaller Star Navy ships may continue to survive among other humanoid races.

December Earth is now a holding of the Praezorian Empire.

Empire Universe
In the Empire Universe, Earth is the central planet of the vast Empire of Sol, home of its emperor and seat of its powerful aristocracy. Resources flow to it from far and wide in order to support its large Imperial Navy.