Jupiter's Great Red Spot is a giant anticyclone wider than our entire planet, with winds of several hundred km/h. It has been watched continuously since at least the 1830s, and possibly since the 17th century. But it has been clearly shrinking for over a century, and no one knows whether it will eventually vanish.
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.