Under a dark sky, look for the faint fuzzy patch just below the three aligned stars of Orion's Belt, a constellation visible from both hemispheres. That's the Orion Nebula, a cloud of gas about 1,350 light-years away where thousands of stars are being born, many only a few hundred thousand years old. Without any instrument, you are looking at a cradle where stars are born.
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.