Planet (Ice) (celestial objects Planet)

The majority of icy planets went through a period of being barren terrestrials, before being surfaced with ice over the course of many millennia. The exact process for this varies from case to case, but the end result is both common and visually uniform - a bright, reflective planet scored by countless fractures and crevasses. A few icy planets are hypothesized to have been warmer, liquid-bearing planets in the past that have subsequently frozen, as a result of either stellar cooling or failed terraforming projects.