The Big Bang should have made equal amounts of matter and antimatter, which annihilate on contact. Yet for roughly every billion pairs destroyed, one extra particle of matter survived. Everything that exists, from galaxies to your own body, comes from that tiny surplus. Physics still cannot explain where the imbalance came from.
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.