The Milky Way's disc is about 100,000 light-years across but only around 1,000 light-years thick. That 100-to-1 ratio is the same as a CD: 12 cm wide and 1.2 mm thick. Our galaxy is nothing like a ball; it's a pancake of stars with a slight bulge in the middle.
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.