Stop! It can rain diamonds on other planets

The atmospheres in Neptune, Uranus, and Saturn have such extreme pressure that they can crystallize carbon atoms and turn them into diamonds, American Scientist reports. How do we know this science fact? Researchers were able to create the correct conditions in a lab to prove this occurs on Neptune and Uranus. Separately, other researchers speculate that it may rain as much as 2.2 million pounds of diamonds on parts of Saturn every year.