NASA recently released this Cassini spacecraft image of Saturn’s moon Iapetus. The image, actually taken last August, shows Iapetus looking strikingly similar to the Chinese taiji symbol, what many called the yin-yang symbol. This symbol represents nature’s duality: up and down, black and white, hot and cold.
And, in fact, there are yin and yang aspects to Saturn’s moon. It’s sometimes called a two-faced moon because one side appears dark (yin), and the other side is light (yang). Read more: Hal Levison on Saturn’s weird moon Iapetus