Contrary to the movies, a person exposed to vacuum does not explode or freeze instantly: the skin is strong enough to hold the body together. The real danger is lack of oxygen, which causes unconsciousness within 10 to 15 seconds. In 1966, a technician caught in a vacuum chamber leak recovered fully; he remembered the saliva bubbling on his tongue.
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.