At Saturn's north pole, a jet stream traces an almost perfect hexagon, each side longer than Earth is wide. Spotted by the Voyager probes in the 1980s, it was studied in detail by Cassini. Lab experiments show that spinning fluids can naturally arrange themselves into polygons like this.
A large share of Earth's water molecules formed in the interstellar cloud that existed before the Sun was even born, more than 4.6 billion years ago. You are literally drinking a cosmic fossil.
By day, the Martian sky looks butterscotch because of fine dust hanging in the air. But at dusk, those same grains scatter blue light forward, creating a bluish glow around the Sun. Rovers have photographed these blue sunsets: the exact reverse of what we see on Earth.