Celvlo IV was the fourth planet in the Celvlo system, in the Obtrexta sector. Although it was far from its sun, the planet developed a high amount of natural greenhouse gases. Its animals, its plants, and its many volcanoes contributed to the insulating layer. However, the planet's low gravity allowed the edge of its atmosphere to slip off at a rate just right to make a warm planet far from its sun. Its moon's gravity stripped off some of the gases and added them to its own atmosphere.