Its raining diamonds on Uranus and Neptune.
People often talk about it "raining money" or getting "pennies from heaven." In reality, if riches did fall from the sky, you'd be too busy running for your life to appreciate your good fortune. That's exactly what happens on Uranus and Neptune, two of the most mysterious planets in our solar system. Scientists say that they have solid diamond rain. The first thing you notice about Uranus and Neptune is that they're blue. That comes from the fact that along with hydrogen and helium, their atmospheres have large amounts of methane. Scientists think that when lightning storms strike clouds of methane (good ol' CH4), carbon atoms break away from their chemical bonds and float through the air by themselves. These lonely carbon atoms begin to collect in clouds of soot that sink into the lower reaches of the atmosphere, where the pressure and temperature around them steadily rises. Eventually, the forces become so great that the carbon atoms squeeze ...