Caesar (Planet)

Caesar is an Earth-like planet with life that is located in our Solar System. It was terraformed by a group of ancient time-traveling intelligent aliens who brought some modern plants and animals and some prehistoric animals into the planet after it was terraformed (adding ozone, oxygen, etc, to the planet). The planet now has a volcano, which pumps out gasses to helps keep the ozone layer still existing, but fortunately, the volcano has never erupted and shows no since of ever erupting in even the distant future.