This may come as a shock, but it’s raining diamonds on two of the planets in our solar system.
“Rain” droplets fall from the atmosphere of Uranus and Neptune. However, these droplets aren’t really rain. They are diamond particles, which form in the atmosphere of these planets thanks to their specific ambient atmospheric pressure. These two planets have high concentrations of methane, which turns into diamond droplets. How is this possible? Well, the methane transforms into diamond at a temperature of 2200 – 3000 degrees Kelvin. The high pressure and temperature of Uranus and Neptune transform the methane into complex compounds of organic matter and diamonds.
This diamond rain is a partial factor for Neptune’s heat radiation. Since the diamonds release energy while they are falling from the atmosphere and towards Neptune’s surface, they give the planet’s magnetic field a huge boost, which also increases the heat being radiated from the planet.