About 380,000 years after the Big Bang, the Universe turned transparent and released light that still fills all of space, now cooled into microwaves: the cosmic microwave background. On an old antenna TV tuned between channels, about 1% of the static came from this radiation. You were watching the oldest light in the Universe.
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.