Mars

Mars
Mars is a planet located in the Sol System and is the 4th planet from its host star with its neighboring planets being Earth and Jupiter. Its orbit being about 687 Earth days long and a Martian day being about 24 hours and 37 minutes long. Its atmosphere being almost 100% made up of Carbon Dioxide. Mars is about 10 times smaller than Earth with a 3rd of Earth's gravity.

Native Life
Mars was home to the Martians who attempted to invade Earth as Mars was dying, but since the Martian invasion failed the Martians were stuck and eventually went extinct sometime in the 2010s. Since all of Mars above ground water has dried up all of Mars flora has also gone extinct but what did use to exist was all green like Earth's flora.

Colonization
Mars has been fully colonized by Humans by the time that That One Reality takes place. Mars has huge city's and archaeology of the extinct Martian race is a very popular subject on the planet as well.