What would make more sense (since distance is relative) is that colder planets do not happen to appear near blue super giant stars (Those things are freaking hot!)... or other hot main sequence stars. 

They should probably be limited to mainly appear near older, colder stars. Would make it more realistic, and it should be easy enough to implement. 

Aiyen wrote:

What would make more sense (since distance is relative) is that colder planets do not happen to appear near blue super giant stars (Those things are freaking hot!)... or other hot main sequence stars. 

They should probably be limited to mainly appear near older, colder stars. Would make it more realistic, and it should be easy enough to implement. 

Distance is relative, as you said. An ice world could exist both around a dwarf star and a blue giant, only at different distances. Keep also in mind that the average temperature of a planet is mostly determined by optical factors : how much light is reflected away or absorbed by the ground and the atmosphere; how much heat is radiated away and how much is reflected back by the atmosphere. For example, Venus has a average temperature of 735 degrees Kelvin while Mercury's temperature peaks at 700 Kelvins during the day (and dips at just 100 Kelvins during the night).

Some models also suggest that Earth might have been a frozen world, covered in ice from pole to pole. This is because ice reflects more sunlight into space than water, meaning that growing ice sheets would cool down the planet further, creation a positive feedback or chain-reaction that ends in total ice coverage.

Global temperature fell so low that the equator was as cold as modern-day Antarctica.^[54] This low temperature was maintained by the high albedo of the ice sheets, which reflected most incoming solar energy into space. A lack of heat-retaining clouds, caused by water vapor freezing out of the atmosphere, amplified this effect.          https://en.wikipedia.org/wiki/Snowball_Earth

Cyclic increases in solar activity or similar cosmic phenomenons could never reverse that process, nor can decreases in the sun's intensity cool down Venus. The most likely hypothesis is that temperatures only rised when volcanic activity dramatically increased the atmospheric concentration of CO2, sounding the return of a strong greenhouse effect. Without geothermic activity (a feature many planets lack), Earth would have been a Pale White Dot forever.