Laboratory experiments show that at temperatures and pressures present inside the atmospheres of Uranus and Neptune, methane can decompose, and the released carbon can form crystals of diamond perhaps the size of pebbles. A continuous hailstorm of diamonds falling into the planet’s interior would release energy and could help warm the planet. This process has not been observed, but it serves to warn you that other worlds are truly un-Earthly and may harbor processes you can hardly imagine.
((just something cool I read in my text book))
