evelite

大部分的冰体行星在历史上都有一段贫瘠时期，在过后的漫长时期中它们的表面又被冰层所覆盖。表层冰盖生长的过程会因具体条件差异而不尽相同，但是最终的结果从形式上和外观上都是类似的：明亮、高反射率的行星表面上布满了数不清的断层和裂谷。有人推测部分冰体行星在过去可能经历过一段温暖的时期，曾经的液态地表水被冻结成为厚厚的冰层。造成这种结果的原因大多是因为星体本身温度的降低或者是失败的地貌改造工程。

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.