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.
Uranus's spin axis is tilted by about 98 degrees, so the planet essentially rolls around its orbit on its side. Over its 84-year year, each pole gets roughly 42 years of continuous daylight, then 42 years of night. A giant collision early in its history may explain this odd posture.