CHATBOT: 1. Rocky: The most common class of rocky planets, accounting for the majority of observed planets. These planets consist primarily of silicate rocks and metals, with a solid surface. It is estimated that rocky planets make up around 70% of known planets. 2. Ice: These planets are less common than rocky planets, but still significant in number. Ice planets are primarily composed of various frozen substances, such as water, methane, or ammonia. They often have extremely low temperatures and icy surfaces. Ice planets make up approximately 20% of known planets. 3. Diamond: Diamond planets are relatively rare in comparison to rocky and ice planets. Composed primarily of carbon, these planets are believed to have a subsurface layer of diamonds due to high pressures. They are extremely unique and valuable celestial bodies. Diamond planets are estimated to constitute about 5% of known planets. 4. Crystal: Iridescent crystal world: This class of planet is exceptionally rare and possesses a striking iridescent crystal texture on its surface. The mineral composition of these planets is still unknown, but their unique appearance suggests the presence of unusual crystal structures. Iridescent crystal worlds are estimated to comprise around 5% of known planets, making them exceedingly rare and intriguing phenomena in the universe. Temperature range for Ice planets: Ice planets have temperatures that can vary widely depending on their distance from their star, but in general, they have temperatures below freezing point. As a reference, the Kelvin range for ice is typically between 90 K (-183.15degC) and 273 K (0degC). However, this range may vary depending on the specific composition of the frozen substances present on the planet.