* Ice Planets -- Planets whose entire surfaces look like Greenland glaciers. Somewhat [[JustifiedTrope justified]], as there actually are frozen over planets and moons (for example, several moons of Jupiter & Saturn). Planets that normally have large oceans (like Earth) can look like this during a ''really deep'' IceAge, and paleontologists believe that this may have happened to Earth in the past in a controversial scenario known as "[[http://en.wikipedia.org/wiki/Snowball_Earth Snowball Earth]]". The obvious question on an Ice planet is how it sustains life if there are so few plants to provide oxygen and a food chain; this paradox can be somewhat solved by allowing for a narrow equatorial band warm enough to support plant life, or by limiting life to the sea and having the food chain be based on geothermal energy/chemosynthesis (i.e. how we think life on Europa would work).  It's interesting to note that the Saturn's Moon Titan, while being an "Ice World" of &#8722;179.2 °C, seems to be in every way just as dynamic and varied a planet as the Earth.

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