Stars, planets, gas, dust, you: all “ordinary” matter makes up only about 5% of the universe's content. The rest is dark matter (around 27%), which emits no light but betrays itself through gravity, and dark energy (around 68%), which is speeding up cosmic expansion. So far, nobody really knows what either of them is.
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.