According to a world atlas of light pollution published in 2016, artificial lighting hides our galaxy's glowing band from more than a third of people. Around 80% of the world's population lives under light-polluted night skies. Our ancestors could see thousands of stars with the naked eye; in the heart of a big city, sometimes only a few dozen remain.
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.