By tracking stars whipping around an invisible point for decades, astronomers weighed the object at the centre of the Milky Way: about 4 million solar masses packed into a region smaller than our solar system. This black hole is called Sagittarius A*, and the work behind it won the 2020 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.