Michel Mayor and Didier Queloz discovered 51 Pegasi b, a gas giant similar to Jupiter that circles its star in just four days. No one thought such a planet could exist so close to its sun. This "hot Jupiter" launched the hunt for exoplanets, which now number more than 6,000 confirmed, and earned the 2019 Nobel Prize in Physics.
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.