Species of Sentient beings.
Aeris itself is very much like mankind's homeworld, Earth. However, there are several major differences.
Size, Climate, and Orbit.Edit
Firstly, Aeris is somewhat smaller than earth with an equatorial diameter of 7,620 miles. It also orbits a little furthur away from it's sun, orbiting between 37 and 38 million miles. It's years are 372 days long, and it's days are 27 hours long. Because of this, It is somewhat cooler than Earth, being predominantly temperate with little desert or tropical regions.