In 1993, the Galileo spacecraft flew past the asteroid Ida, about 60 km long. Studying the images, scientists spotted a tiny pebble roughly 1.5 km wide circling it: Dactyl, the first confirmed moon of an asteroid. Hundreds of binary asteroids are now known, including the pair that the DART mission struck in 2022.
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.