As it orbits, our planet constantly sweeps up debris from comets and asteroids. Estimates suggest tens of tonnes of cosmic dust enter the atmosphere every day, and some of it settles all the way to the ground. Researchers have even found micrometeorites in the gutters of city rooftops.
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.