You might assume Mercury, the closest planet to the Sun, is the hottest. It isn't: Venus is, at about 465 °C day and night, hot enough to melt lead. Its thick carbon dioxide atmosphere traps heat in a runaway greenhouse effect, while airless Mercury lets its heat escape and freezes at night.
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.