This small cluster of bluish stars, visible to the naked eye from almost anywhere on Earth, is only about 100 million years old. When those stars switched on, dinosaurs had already roamed the planet for more than 100 million years. Next to them, the 4.6-billion-year-old Sun is a pensioner. And within a few hundred million years, the cluster will have drifted apart.
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.