Titan, Saturn's largest moon, pairs an atmosphere thicker than ours, with 1.5 times the surface pressure, with gravity about seven times weaker. Strap wings to your arms and you could literally take off. It also has methane lakes and rain: the only other known world with stable liquids on its surface.
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.