Earth

Earth is the home planet of humans and the founding planet of the Interstellar Union of Earth. Earth formerly harboured extensive animal and plant life, with over 8 million different species having inhabited the planet. Earth's atmosphere was primarily nitrogen and oxygen, which helped to support a variety of different genomes of species, including mammals, reptiles, amphibians, avians, insectoids, and many others. The surface of the planet consisted mostly of saline water, contributing to 71% of the planet's surface. The remaining 29% of the surface area was populated with dense forests, snow-covered mountains, and vast deserts.

The most expansive intelligent species to evolve from Earth were humans, whom of which expanded rapidly with industrial farms, cities and interstellar colonies. After thousands of years spreading across the planet's surface, humans discovered steam engines and began to pollute the planet's atmosphere to dangerous levels. The increase in CO2affected the diverse ecosystems of the planet, making many species extinct and endangering human life.