On a truly dark night, three galaxies beyond our own are visible without any instrument: the Andromeda Galaxy, from most of the globe, plus the Large and Small Magellanic Clouds from the Southern Hemisphere. The two Clouds, about 160,000 and 200,000 light-years away, are satellite galaxies of the Milky Way.
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.