Titan, Saturn's largest moon, is the only known world besides Earth with stable lakes and seas on its surface. But they are filled with liquid methane and ethane at around −180 °C. The Cassini probe mapped river channels and spotted signs of rainfall there: a cycle just like Earth's water cycle, running on a different liquid.
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.