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.
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.